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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaptions (Details) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | 12 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Jun. 30, 2014
Interest Rate Swaption [Member]
|
Mar. 31, 2014
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Interest Rate Swaption [Member]
|
Jun. 30, 2013
Interest Rate Swaption [Member]
|
Mar. 31, 2013
Interest Rate Swaption [Member]
|
Dec. 31, 2012
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Long [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Long [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Long [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Long [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Long [Member]
Less Than Six Months Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Long [Member]
Less Than Six Months Remaining Maturity [Member]
Underlying Swap [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Long [Member]
Six Months or Longer Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Long [Member]
Six Months or Longer Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Long [Member]
Six Months or Longer Remaining Maturity [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Long [Member]
Six Months or Longer Remaining Maturity [Member]
Underlying Swap [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Short [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Short [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Short [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Short [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Short [Member]
Less Than Six Months Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Short [Member]
Less Than Six Months Remaining Maturity [Member]
Underlying Swap [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Short [Member]
Six Months or Longer Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Short [Member]
Six Months or Longer Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Variable Income Interest Rate [Member]
Short [Member]
Six Months or Longer Remaining Maturity [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Variable Income Interest Rate [Member]
Short [Member]
Six Months or Longer Remaining Maturity [Member]
Underlying Swap [Member]
|
Jun. 30, 2014
Fixed Income Interest Rate [Member]
Long [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Long [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Fixed Income Interest Rate [Member]
Long [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Long [Member]
Underlying Swap [Member]
|
Jun. 30, 2014
Fixed Income Interest Rate [Member]
Long [Member]
Less Than Six Months Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Long [Member]
Less Than Six Months Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Fixed Income Interest Rate [Member]
Long [Member]
Less Than Six Months Remaining Maturity [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Long [Member]
Less Than Six Months Remaining Maturity [Member]
Underlying Swap [Member]
|
Jun. 30, 2014
Fixed Income Interest Rate [Member]
Long [Member]
Six Months or Longer Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Fixed Income Interest Rate [Member]
Long [Member]
Six Months or Longer Remaining Maturity [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Short [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Short [Member]
Underlying Swap [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Short [Member]
Less Than Six Months Remaining Maturity [Member]
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Fixed Income Interest Rate [Member]
Short [Member]
Less Than Six Months Remaining Maturity [Member]
Underlying Swap [Member]
|
|
| Derivative [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||
| Derivative, Cost | $ 223,504 | $ 233,935 | $ 10,431 | $ 223,504 | $ 223,504 | $ (81,248) | $ (84,703) | $ (3,455) | $ (81,248) | $ (81,248) | $ 11,006 | $ 3,991 | $ 10,106 | $ 3,991 | $ 900 | $ (3,455) | $ (3,455) | |||||||||||||||||||||||||||||
| Derivative Asset, Fair Value, Net | 146,198 | 363,566 | 10,458 | 146,198 | 353,108 | (42,882) | (94,040) | (7,679) | (42,882) | (86,361) | 3,512 | 681 | 3,171 | 681 | 341 | (462) | (462) | |||||||||||||||||||||||||||||
| Derivative, Average Remaining Period Until Maturity | 34.34 | 38.16 | 9.0 | 9.1 | 2.78 | 10.0 | 34.34 | 39.14 | 9.0 | 9.0 | 36.02 | 33.68 | 10.0 | 8.1 | 1.93 | 5.0 | 36.02 | 42.02 | 10.0 | 10.0 | 4.48 | 1.93 | 5.2 | 10.0 | 3.61 | 1.93 | 5.3 | 10.0 | 6.30 | 5.0 | 1.93 | 5.0 | 1.93 | 5.0 | ||||||||||||
| Derivative, Notional Amount | $ 43,379,217 | $ 43,576,146 | $ 37,366,610 | $ 44,262,605 | $ 27,041,328 | $ 22,377,656 | $ 11,450,000 | $ 9,500,000 | $ 5,130,000 | $ 6,250,000 | $ 5,800,000 | $ 4,950,000 | $ 6,000,000 | $ 6,675,000 | $ 675,000 | $ 6,000,000 | $ 6,000,000 | $ (800,000) | $ (1,310,000) | $ (510,000) | $ (800,000) | $ (800,000) | $ 6,250,000 | $ 275,000 | $ 4,250,000 | $ 275,000 | $ 2,000,000 | $ (510,000) | $ (510,000) | |||||||||||||||||
| Derivative, Description of Variable Reference Rate | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | 3M Libor | |||||||||||||||||||||||||||||
| Derivative, Average Fixed Interest Rate | 4.274% | 4.178% | 3.326% | 4.274% | 4.274% | 3.438% | 2.722% | 1.60% | 3.438% | 3.438% | 1.43% | 2.89% | 1.594% | 2.89% | 1.08% | 1.60% | 1.60% |