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Net Earnings Per Share (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
item
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Anti-dilutive securities                      
Number of classes of common stock | item                 2    
Numerator                      
Preferred stock dividends                 $ (11,958)    
Net income available to common stockholders $ 161,092 $ 151,943 $ 124,034 $ 138,094 $ 138,399 $ 146,574 $ 115,211 $ 110,651 $ 575,163 $ 510,835 $ 756,152
Denominator                      
Weighted-average common shares outstanding | shares                 111,895,433 104,716,301 103,189,175
Basic earnings per share (in dollars per share) | $ / shares $ 1.43 $ 1.36 $ 1.11 $ 1.24 $ 1.29 $ 1.41 $ 1.11 $ 1.07 $ 5.14 $ 4.88 $ 7.33
Numerator                      
Net income                 $ 587,121 $ 510,835 $ 756,152
Preferred dividends paid                 (11,958)    
Assumed conversion of convertible senior notes                   6,219 5,842
Net income plus assumed conversions                 $ 575,163 $ 517,054 $ 761,994
Denominator                      
Number of shares used in basic computation | shares                 111,895,433 104,716,301 103,189,175
Weighted-average effect of dilutive securities (in shares) | shares                 1,190,890 7,647,030 8,468,389
Number of shares used in per share computation | shares                 113,086,323 112,363,331 111,657,564
Diluted net income per share (in dollars per share) | $ / shares $ 1.42 $ 1.34 $ 1.10 $ 1.23 $ 1.24 $ 1.32 $ 1.04 $ 1.00 $ 5.09 $ 4.60 $ 6.82
Restricted Stock Units                      
Anti-dilutive securities                      
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares) | shares                 945,565 931,943 1,085,048