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
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 13,316,881 $ 9,316,351
Net Counterparty Exposure 1,641,624 1,435,401
Repurchase Agreement Counterparty, Barclays Capital [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 1,362,780 292,086
Net Counterparty Exposure $ 254,533 $ 164,315
Percent of Equity 7.00% 5.00%
Weighted Average Days to Maturity 74 days 26 days
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 11,954,101 $ 9,024,265
Net Counterparty Exposure $ 1,387,091 $ 1,271,086
Percent of Equity 37.00% 37.00%
Weighted Average Days to Maturity 100 days 79 days
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 24 22