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Stock-Based Compensation Plans (Details) | 12 Months Ended
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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 |

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