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Stock-Based Compensation Plans (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
director
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Unrecognized compensation cost and vesting period      
Unrecognized compensation costs related to unvested stock-based compensation arrangements $ 13,300,000    
Weighted-average period for recognition of unrecognized stock-based compensation expense 2 years 1 month 6 days    
Other disclosures      
Stock-based compensation expense recognized in operating expenses $ (11,384,000) $ (9,480,000) $ (10,356,000)
Requisite service period for options to vest 4 years    
Tax benefit of stock-based compensation expense in provision for income taxes $ 2,859,000 2,330,000 2,476,000
Share-based Payment Arrangement, Expense, after Tax 8,525,000 7,150,000 7,880,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 21,921,000 16,760,000 15,372,000
Issuance of Company’s common stock $ 0 $ 0 695,000
Vesting period 3 years    
Restricted Stock Units      
Restricted stock unit activity      
Outstanding at the beginning of the period (in shares) | shares 462,000    
Awarded (in shares) | shares 166,951    
Vested (in shares) | shares (259,000)    
Forfeited (in shares) | shares (13,000)    
Outstanding at the end of the period (in shares) | shares 357,000 462,000  
Outstanding and expected to vest at the end of the period (in shares) | shares 351,000    
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 47.75    
Awarded (in dollars per share) | $ / shares 74.91    
Vested (in dollars per share) | $ / shares 40.92    
Forfeited (in dollars per share) | $ / shares 57.83    
Outstanding at the end of the period (in dollars per share) | $ / shares 66.13 $ 47.75  
Outstanding and expected to vest at the end of the period (in dollars per share) | $ / shares $ 66.05    
Aggregate Intrinsic Value      
Outstanding at the end of the period (in dollars) $ 33,188,000 $ 37,065,000  
Outstanding and expected to vest at end of the period (in dollars) $ 32,839,000    
Closing price per share (in dollars per share) | $ / shares $ 93.45    
Total intrinsic value of awards vested (in dollars) $ 21,900,000 $ 16,700,000 $ 9,800,000
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 47.75    
Forfeited (in dollars per share) | $ / shares 57.83    
Outstanding at the end of the period (in dollars per share) | $ / shares $ 66.13 $ 47.75  
Aggregate Intrinsic Value      
Outstanding at the end of the period (in dollars) $ 33,188,000 $ 37,065,000  
Other disclosures      
Stock-based compensation expense recognized in operating expenses $ (543,000)    
Phantom Share Units (PSUs)      
Other disclosures      
Vesting period 3 years    
2011 Plan | Non-Qualified Stock Options      
Stock-Based Compensation      
Maximum common stock shares that may be issued under plan | shares 16,300,000    
Stock Bonus Plan      
Other disclosures      
Stock-based compensation expense recognized in operating expenses $ (1,200,000) $ (800,000)  
Independent directors | Restricted Stock Units      
Aggregate Intrinsic Value      
Number Of Directors | director 7    
Other disclosures      
Share-based Goods and Nonemployee Services Transaction 690 thousand    
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued | shares 9,239    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares $ 74.66    
Foreign employees      
Other disclosures      
Shares issued and committed to issue | shares 12,600 7,000  
Shares committed to be issued | shares 7,400 4,000  
Shares expected to be settled In cash | shares 5,200 3,000