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Net Income 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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic Earnings                      
Net income $ 71,903 $ 29,089 $ 61,424 $ 67,758 $ 52,990 $ 62,217 $ 55,346 $ 49,433 $ 230,174 $ 219,986 $ 193,031
Less: Preferred dividends (3,386) (3,385) (4,919) (6,835) (6,835) (6,836) (6,834) (6,835) (18,525) (27,340) (36,761)
Net income available to common stockholders $ 68,517 $ 25,704 $ 56,505 $ 60,923 $ 46,155 $ 55,381 $ 48,512 $ 42,598 211,649 192,646 156,270
Less: Dividends on participating securities                 (3,867) (3,405) (2,913)
Basic Earnings                 207,782 189,241 153,357
Diluted Earnings                      
Net income available to common stockholders                 211,649 192,646 156,270
Add: Interest expense on Notes                 35,173 34,779  
Diluted Earnings                 $ 246,822 $ 227,425 $ 156,270
Number of Shares:                      
Basic weighted-average shares of common stock outstanding (in shares) 153,537,074 153,531,678 145,567,963 134,607,107 133,852,915 129,188,343 123,019,993 110,211,853 146,881,231 124,147,073 99,859,153
Diluted weighted-average shares of common stock outstanding (in shares) 182,070,345 153,531,678 174,101,234 164,683,086 163,900,633 153,918,435 124,629,317 111,871,429 175,794,896 153,821,515 101,232,610
Earnings Per Share Attributable to common stockholders                      
Basic (in dollars per share) $ 0.44 $ 0.16 $ 0.38 $ 0.45 $ 0.34 $ 0.42 $ 0.39 $ 0.38 $ 1.41 $ 1.52 $ 1.54
Diluted (in dollars per share) $ 0.42 $ 0.16 $ 0.37 $ 0.43 $ 0.34 $ 0.40 $ 0.39 $ 0.38 $ 1.40 $ 1.48 $ 1.54