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)
$ in Thousands
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Repurchase Agreement Counterparty [Line Items]    
Payables to Broker-Dealers and Clearing Organizations $ 796,200  
Assets Sold under Agreements to Repurchase, Repurchase Liability 6,189,852 $ 5,008,274
Repurchase Agreement Counterparty, Amount at Risk 1,072,262 1,035,785
Repurchase Agreement Counterparty, Royal Bank of Canada [Member]    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 691,801 799,527
Repurchase Agreement Counterparty, Amount at Risk $ 205,517 $ 217,677
Repurchase Agreement Counterparty, Percent of Equity at Risk 6.00% 6.00%
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 56.1 31.5
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 5,498,051 $ 4,208,747
Repurchase Agreement Counterparty, Amount at Risk $ 866,745 $ 818,108
Repurchase Agreement Counterparty, Percent of Equity at Risk 26.00% 23.00%
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 63.1 36.2
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 19 20