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Repurchase Agreements (Borrowings Under Repurchase Agreement And Associated Assets Pledged as Collateral) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 7,278,270 $ 6,614,701
Unamortized debt issuance expense 19 206
Agency MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements 2,584,097 2,501,340
Fair value of securities pledged as collateral under repurchase agreements $ 2,792,396 $ 2,705,754
Weighted average haircut (percent) 4.48% 4.65%
Non-Agency MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 1,592,067 $ 1,256,033
Fair value of securities pledged as collateral under repurchase agreements $ 2,075,540 $ 1,652,983
Weighted average haircut (percent) 21.70% 21.87%
RPL/NPL MBS    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 913,249 $ 567,140
Fair value of securities pledged as collateral under repurchase agreements $ 1,161,568 $ 726,540
Weighted average haircut (percent) 21.22% 22.05%
U.S. Treasury securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 0 $ 470,334
Fair value of securities pledged as collateral under repurchase agreements $ 0 $ 472,095
Weighted average haircut (percent) 0.00% 1.47%
CRT securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 405,168 $ 459,058
Fair value of securities pledged as collateral under repurchase agreements $ 504,931 $ 595,900
Weighted average haircut (percent) 19.73% 22.16%
MSR related assets    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 435,762 $ 317,255
Fair value of securities pledged as collateral under repurchase agreements $ 565,272 $ 482,158
Weighted average haircut (percent) 22.56% 33.19%
Residential whole loans    
Assets Sold under Agreements to Repurchase [Line Items]    
Balance of repurchase agreements $ 1,347,946 $ 1,043,747
Fair value of securities pledged as collateral under repurchase agreements $ 1,888,445 $ 1,474,704
Weighted average haircut (percent) 21.93% 26.10%
Repurchase Agreement Borrowings    
Assets Sold under Agreements to Repurchase [Line Items]    
Weighted average remaining term-to-interest rate reset of borrowings under repurchase agreements, days 25 days 16 days
Effective repricing period, months 11 months 11 months
Balance of repurchase agreements $ 7,278,289 $ 6,614,907
Unamortized debt issuance expense 19 $ 206
Loan Securitization    
Assets Sold under Agreements to Repurchase [Line Items]    
Fair value of securities pledged as collateral under repurchase agreements $ 27,000