|
Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaptions (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Dec. 31, 2012
|
Sep. 30, 2014
Interest Rate Swaption [Member]
|
Jun. 30, 2014
Interest Rate Swaption [Member]
|
Dec. 31, 2013
Interest Rate Swaption [Member]
|
Sep. 30, 2013
Interest Rate Swaption [Member]
|
Jun. 30, 2013
Interest Rate Swaption [Member]
|
Dec. 31, 2012
Interest Rate Swaption [Member]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
Sep. 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]
|
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 | $ 190,208 | $ 233,935 | $ 10,431 | $ 190,208 | $ 223,504 | $ (81,248) | $ (84,703) | $ (3,455) | $ (81,248) | $ (81,248) | $ 5,181 | $ 3,991 | $ 5,181 | $ 3,991 | $ (3,455) | $ (3,455) | ||||||||||||||||||||||||||||
| Derivative Asset, Fair Value, Net | 130,263 | 363,566 | 10,458 | 130,263 | 353,108 | (36,651) | (94,040) | (7,679) | (36,651) | (86,361) | 776 | 681 | 776 | 681 | (462) | (462) | ||||||||||||||||||||||||||||
| Derivative, Average Remaining Period Until Maturity | 45.89 | 38.16 | 8.8 | 9.1 | 2.78 | 10.0 | 45.89 | 39.14 | 8.8 | 9.0 | 33.02 | 33.68 | 10.0 | 8.1 | 1.93 | 5.0 | 33.02 | 42.02 | 10.0 | 10.0 | 2.17 | 1.93 | 5.4 | 10.0 | 2.17 | 1.93 | 5.4 | 10.0 | 1.93 | 5.0 | 1.93 | 5.0 | ||||||||||||
| Derivative, Notional Amount | $ 57,015,981 | $ 43,379,217 | $ 37,366,610 | $ 36,472,401 | $ 44,262,605 | $ 22,377,656 | $ 7,660,000 | $ 11,450,000 | $ 5,130,000 | $ 4,430,000 | $ 6,250,000 | $ 4,950,000 | $ 5,210,000 | $ 6,675,000 | $ 675,000 | $ 5,210,000 | $ 6,000,000 | $ (800,000) | $ (1,310,000) | $ (510,000) | $ (800,000) | $ (800,000) | $ 3,250,000 | $ 275,000 | $ 3,250,000 | $ 275,000 | $ (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 | ||||||||||||||||||||||||||||
| Derivative, Average Fixed Interest Rate | 4.268% | 4.178% | 3.326% | 4.268% | 4.274% | 3.438% | 2.722% | 1.60% | 3.438% | 3.438% | 1.334% | 2.89% | 1.334% | 2.89% | 1.60% | 1.60% |