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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, 2019 USD ($) installment $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized (in shares) | shares | 10,000,000 |  |
Shares available for grant (in shares) | shares | 3,254,822 |  |
Share-based compensation expense | $ 25,300 | $ 18,600 | $ 9,400
Total compensation cost not yet recognized | $ 20,400 |  |
Annual awards of deferred stock units to be issued to each non-employee director, aggregate fair value |  | $ 110 | $ 110
Weighted-average grant-date fair values (in dollars per share) | $ / shares | $ 20.99 | $ 15.14 | $ 8.89
Total intrinsic value | $ 7,700 | $ 3,900 | $ 4,900
Cash received from exercises of awards | 2,400 | 900 | 4,000
Total tax benefit realized for tax deductions from exercise of awards | $ 1,600 | 800 | 1,700
Total fair value of DSUs that vested during the years |  | 1,000 | 900
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 | 1,082,460 |  |
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 | 24,800 | 8,700 | 3,200
Tax benefits for tax deductions realized from awards | $ 5,200 | $ 1,800 | $ 1,100
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 | 438,402 |  |
Number of additional shares to be granted if maximum performance level is met or exceeded (in shares) | shares | 146,134 |  |
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 | 412,029 |  |
Number of additional shares to be granted if maximum performance level is met or exceeded (in shares) | shares | 137,343 |  |
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 | 232,029 |  |
Number of additional shares to be granted if maximum performance level is met or exceeded (in shares) | shares | 77,343 |  |

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