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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, 2016
Dec. 31, 2015
Repurchase Agreements [Line Items]    
Repurchase agreements [1] $ 1,133,841 $ 1,222,719
Debt, Weighted Average Interest Rate 0.66% 0.54%
Repurchase Agreement Weighted Average Maturity Of Agreements 42 days 37 days
Maturity up to 30 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 537,508 $ 666,124
Debt, Weighted Average Interest Rate 0.63% 0.52%
Repurchase Agreement Weighted Average Maturity Of Agreements 15 days 14 days
Maturity 31 to 60 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 268,670 $ 336,350
Debt, Weighted Average Interest Rate 0.67% 0.53%
Repurchase Agreement Weighted Average Maturity Of Agreements 43 days 45 days
Maturity 61 to 90 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 292,395 $ 89,142
Debt, Weighted Average Interest Rate 0.71% 0.70%
Repurchase Agreement Weighted Average Maturity Of Agreements 74 days 74 days
Maturity 91 to 120 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 0 $ 131,103
Debt, Weighted Average Interest Rate 0.00% 0.53%
Repurchase Agreement Weighted Average Maturity Of Agreements 0 days 106 days
Matuirty 151 to 180 days [Member]    
Repurchase Agreements [Line Items]    
Repurchase agreements $ 35,268 $ 0
Debt, Weighted Average Interest Rate 0.82% 0.00%
Repurchase Agreement Weighted Average Maturity Of Agreements 167 days 0 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.