Quarterly report pursuant to Section 13 or 15(d)

Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details)

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Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 12,021,177 $ 12,250,450
Repurchase Agreement Counterparty, Barclays Capital [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 1,423,953 1,453,396
Repurchase Agreement Counterparty, Amount at Risk 297,203 302,744
Repurchase Agreement Counterparty, Percent of Equity at Risk 8.00% 8.00%
Repurchase Agreement Counterparty, Weighted Average Maturity 75.8 74.6
Repurchase Agreement Counterparty, All Other Counterparties [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 9,600,974 9,799,554
Repurchase Agreement Counterparty, Amount at Risk 1,290,831 1,372,086
Repurchase Agreement Counterparty, Percent of Equity at Risk 33.00% 36.00%
Repurchase Agreement Counterparty, Weighted Average Maturity 85.5 71.9
Repurchase Agreement Counterparty, Excluding Repurchase Agreements Collateralized by U.S. Treasuries [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 11,024,927 11,252,950
Repurchase Agreement Counterparty, Amount at Risk 1,588,034 1,674,830
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 21 19
US Treasury Securities [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 996,250 $ 997,500