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Borrowings under Repurchase Agreements Schedule of Repurchase Agreements by Maturity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Repurchase Agreements [Line Items]    
Repurchase agreements [1] $ 1,589,319 $ 1,597,206
Debt, Weighted Average Interest Rate 1.76% 1.47%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 42 days 43 days
Maturity up to 30 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 468,222 $ 410,628
Debt, Weighted Average Interest Rate 1.67% 1.41%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 16 days 15 days
Maturity 31 to 60 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 818,835 $ 906,602
Debt, Weighted Average Interest Rate 1.76% 1.46%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 45 days 46 days
Maturity 61 to 90 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 302,262 $ 273,665
Debt, Weighted Average Interest Rate 1.90% 1.60%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 75 days 74 days
Maturity 91 to 120 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 0 $ 6,311
Debt, Weighted Average Interest Rate 0.00% 1.61%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements 0 days 120 days
[1] In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.