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
Jun. 30, 2014
Dec. 31, 2013
Repurchase Agreement Counterparty [Line Items]    
Payables to Broker-Dealers and Clearing Organizations $ 8,026  
Assets Sold under Agreements to Repurchase, Repurchase Liability 11,391,187 12,250,450
Repurchase Agreement Counterparty, Barclays Capital [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 1,349,730 1,453,396
Repurchase Agreement Counterparty, Amount at Risk 375,863 302,744
Repurchase Agreement Counterparty, Percent of Equity at Risk 9.00% 8.00%
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 90.7 74.6
Repurchase Agreement Counterparty, All Other Counterparties [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 9,041,457 9,799,554
Repurchase Agreement Counterparty, Amount at Risk 1,232,788 1,372,086
Repurchase Agreement Counterparty, Percent of Equity at Risk 30.00% 36.00%
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 65.1 71.9
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 23 19
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 10,391,187 11,252,950
Repurchase Agreement Counterparty, Amount at Risk 1,608,651 1,674,830
US Treasury Securities [Member]
   
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 1,000,000 $ 997,500