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
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Repurchase Agreement Counterparty [Line Items]    
Payables to Broker-Dealers and Clearing Organizations $ 1,235,189  
Assets Sold under Agreements to Repurchase, Repurchase Liability 9,669,848 $ 5,008,274
Repurchase Agreement Counterparty, Amount at Risk 1,252,851 1,035,785
Repurchase Agreement Counterparty, Royal Bank of Canada [Member]    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 977,474 799,527
Repurchase Agreement Counterparty, Amount at Risk $ 227,645 $ 217,677
Repurchase Agreement Counterparty, Percent of Equity at Risk 7.00% 6.00%
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 65.7 31.5
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 8,692,374 $ 4,208,747
Repurchase Agreement Counterparty, Amount at Risk $ 1,025,206 $ 818,108
Repurchase Agreement Counterparty, Percent of Equity at Risk 30.00% 23.00%
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 75.7 36.2
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 22 20