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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Pledged securities $ 1,077,540 $ 1,076,187
Distressed residential mortgage loans, net (including $119,201 and $121,791 held in securitization trusts as of March 31, 2018 and December 31, 2017, respectively) 119,201 121,791
Assets of consolidated VIEs 9,771,205 10,041,468
Liabilities of consolidated VIEs $ 9,157,640 $ 9,436,421
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 200,000,000 200,000,000
Preferred stock, shares issued (in shares) 12,000,000 12,000,000
Preferred stock, shares outstanding (in shares)   12,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 112,116,506 111,909,909
Common stock, shares outstanding (in shares) 112,116,506 111,909,909
Series B Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, cumulative redeemable dividend rate 7.75% 7.75%
Preferred stock, liquidation preference per share (in dollars per share) $ 25 $ 25
Preferred stock, shares authorized (in shares) 6,000,000 6,000,000
Preferred stock, shares issued (in shares) 3,000,000 3,000,000
Preferred stock, shares outstanding (in shares) 3,000,000 3,000,000
Series C Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, cumulative redeemable dividend rate 7.875% 7.875%
Preferred stock, liquidation preference per share (in dollars per share) $ 25 $ 25
Preferred stock, shares authorized (in shares) 4,140,000 4,140,000
Preferred stock, shares issued (in shares) 3,600,000 3,600,000
Preferred stock, shares outstanding (in shares) 3,600,000 3,600,000
Series D Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, cumulative redeemable dividend rate 8.00% 8.00%
Preferred stock, liquidation preference per share (in dollars per share) $ 25.00 $ 25
Preferred stock, shares authorized (in shares) 5,750,000 5,750,000
Preferred stock, shares issued (in shares) 5,400,000 5,400,000
Preferred stock, shares outstanding (in shares) 5,400,000 5,400,000
Available-for-sale securities    
Investment securities, available for sale, at fair value (including pledged securities of $1,077,540 and $1,076,187, as of March 31, 2018 and December 31, 2017, respectively, and $48,857 and $47,922 held in securitization trusts as of March 31, 2018 and December 31, 2017, respectively) $ 48,857 $ 47,922