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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Aug. 20, 2018
Earnings Per Common Share [Line Items]              
Conversion price (in dollars per share) $ 101.38   $ 101.38   $ 101.38 $ 101.38  
Numerator — basic and diluted              
Net income $ 62,782 $ 64,496 $ 48,174 $ 56,747 $ 127,278 $ 104,921  
Denominator              
Weighted average number of common shares outstanding — basic (in shares) 33,458   36,169   33,470 36,292  
Effect of dilutive convertible shares (in shares) 668   732   714 806  
Effect of dilutive stock options (in shares) 376   444   373 453  
Effect of dilutive convertible notes (in shares) 872   507   661 470  
Weighted average number of common shares outstanding — diluted (in shares) 35,374   37,852   35,218 38,021  
Earnings per common share — basic (in dollars per share) $ 1.88   $ 1.33   $ 3.80 $ 2.89  
Earnings per common share — diluted (in dollars per share) $ 1.77   $ 1.27   $ 3.61 $ 2.76  
Stock Options and Restricted Shares              
Denominator              
Antidilutive stock options and restricted shares (in shares) 2   54   5 33  
Senior Notes | 2023 Convertible Notes              
Earnings Per Common Share [Line Items]              
Interest rate (as a percent) 2.00%       2.00%   2.00%
Conversion price (in dollars per share)             $ 101.38