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Share-Based Compensation - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) share-based_compensation_plan shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Feb. 28, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of share-based compensation plans (in shares) | share-based_compensation_plan | 2 |  |  |
Number of shares authorized (in shares) | shares | 15,600,000 |  |  |
Number of shares available for future issuance (in shares) | shares | 3,000,000.0 |  |  |
Proceeds from stock option exercises | $ 44,587 | $ 38,809 | $ 27,639 |
Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option exercisable life | 10 years |  |  |
Total intrinsic value of options exercised | $ 41,300 | 49,500 | 38,000 |
Proceeds from stock option exercises | 44,600 | 38,800 | 27,600 |
Tax benefit realized for the tax deductions from stock options exercised | 8,700 | 10,400 | $ 8,000 |
Total unrecognized compensation cost | $ 9,100 |  |  |
Weighted-average period of total unrecognized compensation cost, in years | 1 year 3 months 18 days |  |  |
Stock Option | Employees |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Total unrecognized compensation cost | $ 5,800 |  |  |
Weighted-average period of total unrecognized compensation cost, in years | 1 year |  |  |
Unvested shares, granted (in shares) | shares | 39,065 |  |  |
Cash-settled Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Share based compensation, accrued expenses | $ 5,400 | 5,500 |  |
Share based compensation, other noncurrent liabilities | $ 2,900 | $ 2,800 |  |
Unvested shares, granted (in shares) | shares | 20,780 |  |  |
Performance Shares Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost | $ 4,800 |  |  |
Weighted-average period of total unrecognized compensation cost, in years | 10 months 24 days |  |  |
Award requisite service period | 3 years |  |  |
Unvested shares, granted (in shares) | shares | 42,690 | 56,860 | 52,375 |
Payout factor, percent | 201.00% |  |  |
Performance Shares Units | Forecast |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued (in shares) | shares |  |  |  | 48,223
Performance Shares Units | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target award | 0.00% |  |  |
Performance Shares Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Target award | 250.00% |  |  |
Target payout | 100.00% |  |  |

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