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Share-Based Compensation - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) share-based_compensation_plan shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of share-based compensation plans | 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 | 5,400,000 |  |  |
Proceeds from stock option exercises | $ 30,240 | $ 19,217 | $ 17,161 |
Forecast |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued (in shares) | shares |  |  |  | 89,288
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 | $ 26,500 | 16,900 | 20,000 |
Proceeds from stock option exercises | 30,200 | 19,200 | 17,200 |
Tax benefit realized for the tax deductions from stock options exercised | 9,600 | 6,100 | $ 7,300 |
Total unrecognized compensation cost | $ 10,800 |  |  |
Weighted-average period of total unrecognized compensation cost, in years | 1 year 4 months 24 days |  |  |
Stock Option | Non-Employee Directors Cliff |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of option | 1 year |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost | $ 5,300 |  |  |
Weighted-average period of total unrecognized compensation cost, in years | 1 year 1 month 6 days |  |  |
Unvested shares, granted (in shares) | shares | 76,970 |  |  |
Cash-settled Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period of option | 3 years |  |  |
Share based compensation, accrued expenses | $ 3,000 | 3,200 |  |
Share based compensation, other noncurrent liabilities | $ 2,400 | $ 1,800 |  |
Unvested shares, granted (in shares) | shares | 41,060 |  |  |
Performance Shares Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost | $ 6,300 |  |  |
Weighted-average period of total unrecognized compensation cost, in years | 1 year |  |  |
Award requisite service period | 3 years |  |  |
Unvested shares, granted (in shares) | shares | 85,130 | 91,030 | 54,065 |
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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