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Long-term Equity-based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized (in shares) | shares | 7,000,000 |  |
Shares available for grant (in shares) | shares | 6,734,289 |  |
Share-based compensation expense | $ 24,900 | $ 25,300 | $ 18,600
Total compensation cost not yet recognized | $ 24,600 |  |
Annual awards of deferred stock units to be issued to each non-employee director, aggregate fair value |  | $ 110 |
Weighted-average grant-date fair values (in dollars per share) | $ / shares | $ 19.24 | $ 20.99 | $ 15.14
Total intrinsic value | $ 7,100 | $ 7,700 | $ 3,900
Cash received from exercises of awards | 5,000 | 2,400 | 900
Total tax benefit realized for tax deductions from exercise of awards | 1,500 | 1,600 | 800
Total fair value of DSUs that vested during the years | $ 0 | 0 | 1,000
Performance Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (in shares) | shares | 1,534,158 |  |
Award vesting period | 3 years |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting installments | installment | 3 |  |
Award vesting period | 3 years |  |
Expiration period | 10 years |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Annual awards of restricted stock units to be issued to each non-employee director, aggregate fair value | $ 130 |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total fair value of vested awards | 20,400 | 24,800 | 8,700
Tax benefits for tax deductions realized from awards | $ 4,300 | $ 5,200 | $ 1,800
Performance Period 1 | Performance Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (in shares) | shares | 746,670 |  |
Number of additional shares to be granted if maximum performance level is met or exceeded (in shares) | shares | 248,890 |  |
Performance Period 2 | Performance Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (in shares) | shares | 404,574 |  |
Number of additional shares to be granted if maximum performance level is met or exceeded (in shares) | shares | 134,858 |  |
Performance Period 3 | Performance Based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (in shares) | shares | 382,914 |  |
Number of additional shares to be granted if maximum performance level is met or exceeded (in shares) | shares | 127,638 |  |

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