Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 19,451,207 $ 8,865,184
Net Counterparty Exposure 1,743,123 1,222,682
Repurchase Agreement Counterparty, Barclays Capital [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 1,958,741 292,086
Net Counterparty Exposure $ 275,128 $ 164,315
Percent of Equity 8.00% 5.00%
Weighted Average Days to Maturity 93 days 26 days
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 17,492,466 $ 8,573,098
Net Counterparty Exposure $ 1,467,995 $ 1,058,367
Percent of Equity 41.00% 31.00%
Weighted Average Days to Maturity 82 days 58 days
Number of repurchase agreement counterparties with whom amount at risk is less than 10 percent of stockholders' equity 26 22