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Earnings Per Share (Details)
 3 Months Ended 9 Months Ended
Jun. 07, 2018
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Jun. 06, 2018
USD ($)
Net Income (Numerator)            
Basic EPS - common stock | $   $ 53,748,000 $ 55,499,000 $ 166,574,000 $ 152,949,000  
Diluted EPS - common stock | $   $ 53,748,000 $ 55,499,000 $ 166,574,000 $ 152,949,000  
Weighted-Average Shares (Denominator)            
Basic EPS - common stock (in shares)   119,476,035 122,244,948 119,940,044 123,050,174  
Effect of dilutive securities:            
Stock options, restricted stock, and ESPP shares (in shares)   520,488 663,588 655,944 798,338  
Diluted EPS - common stock (shares)   119,996,523 122,908,536 120,595,988 123,848,512  
Earnings Per Share            
Basic EPS - common stock (in dollars per share) | $ / shares   $ 0.45 $ 0.45 $ 1.39 $ 1.24  
Diluted EPS - common stock (in dollars per share) | $ / shares   $ 0.45 $ 0.45 $ 1.38 $ 1.23  
Convertible Notes            
Antidilutive Securities Excluded from Computation of Earnings Per Share            
Aggregate principal amount issued | $   $ 217,500,000   $ 217,500,000   $ 217,500,000
Initial conversion rate 0.0450760     0.0450760    
Stock options and restricted share awards            
Antidilutive Securities Excluded from Computation of Earnings Per Share            
Antidilutive shares of common stock   751,973 934,036 715,058 743,553