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Earnings Per Share (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
item
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Anti-dilutive securities            
Number of classes of common stock | item         2  
Numerator            
Net income available to common stockholders | $ $ 116,552     $ 151,943 $ 393,640 $ 414,071
Denominator            
Weighted-average common shares outstanding 113,778,533     112,133,556 113,647,585 111,511,960
Basic earnings per share (in dollars per share) | $ / shares $ 1.02     $ 1.36 $ 3.46 $ 3.71
Numerator            
Net income | $ $ 120,395 $ 147,625 $ 137,151 $ 155,787 $ 405,171 $ 422,186
Preferred stock dividends | $ (3,843)     (3,844) (11,531) (8,115)
Net income available to common stockholders | $ $ 116,552     $ 151,943 $ 393,640 $ 414,071
Denominator            
Number of shares used in basic computation 113,778,533     112,133,556 113,647,585 111,511,960
Weighted-average effect of dilutive securities (in shares) 172,569     1,129,840 281,190 1,325,566
Number of shares used in per share computation 113,951,102     113,263,396 113,928,775 112,837,526
Diluted net income per share (in dollars per share) | $ / shares $ 1.02     $ 1.34 $ 3.46 $ 3.67
Restricted Stock Units            
Anti-dilutive securities            
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares)         1,032,305 946,406