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Net Income (Loss) per Share - Basic and Diluted Net Income per Share of Common Stock Using Two-Class Method (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic Earnings                      
Net income $ 52,990 $ 62,217 $ 55,346 $ 49,433 $ 41,315 $ 68,356 $ 36,235 $ 47,125 $ 219,986 $ 193,031 $ 157,876
Preferred dividends (6,835) (6,836) (6,834) (6,835) (6,993) (11,148) (9,310) (9,310) (27,340) (36,761) (30,295)
Net income available to common stockholders $ 46,155 $ 55,381 $ 48,512 $ 42,598 $ 34,322 $ 57,208 $ 26,925 $ 37,815 192,646 156,270 127,581
Less: Dividends on participating securities                 (3,405) (2,913) (2,087)
Basic Earnings                 189,241 153,357 125,494
Diluted Earnings                      
Net income available to common stockholders                 192,646 156,270 127,581
Add: Interest expense on Notes                 34,779    
Diluted Earnings                 $ 227,425 $ 156,270 $ 127,581
Number of Shares:                      
Basic weighted average shares of common stock outstanding (in shares) 133,852,915 129,188,343 123,019,993 110,211,853 106,721,887 105,446,704 95,428,134 91,612,447 124,147,073 99,859,153 72,371,374
Diluted weighted average shares of common stock outstanding (in shares) 163,900,633 153,918,435 124,629,317 111,871,429 108,095,950 106,812,721 96,796,289 92,998,250 153,821,515 101,232,610 73,305,101
Earnings Per Share Attributable to common stockholders                      
Basic (in dollars per share) $ 0.34 $ 0.42 $ 0.39 $ 0.38 $ 0.32 $ 0.54 $ 0.28 $ 0.41 $ 1.52 $ 1.54 $ 1.74
Diluted (in dollars per share) $ 0.34 $ 0.40 $ 0.39 $ 0.38 $ 0.32 $ 0.54 $ 0.28 $ 0.41 $ 1.48 $ 1.54 $ 1.74