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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator        
Net income (in US dollars) $ 140,595 $ 100,664 $ 252,068 $ 174,050
Denominator        
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 47,393,493 50,507,024 47,584,656 51,610,014
Effect of dilutive securities-Share-based awards (in shares) 195,176 204,746 182,586 204,150
Shares used to compute diluted earnings per common share (in shares) 47,588,669 50,711,770 47,767,242 51,814,164
Basic earnings per common share (in US dollars per share) $ 2.97 $ 1.99 $ 5.30 $ 3.37
Diluted earnings per common share (in US dollars per share) $ 2.95 $ 1.99 $ 5.28 $ 3.36
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares) 8,726 57,949 9,026 57,899