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Equity Incentive Awards - Narratives (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Compensation expense related to restricted stock and stock options |  |  | $ 10,481 | $ 9,995 | $ 9,352
Proceeds from stock options exercised |  |  | $ 100 | $ 3,800 | $ 4,900
Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Vesting period (in years) |  |  | 3 years 6 months |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Grants in period (in shares) |  |  | 193,262 | 385,010 | 260,852
Share based compensation expense to be recognized |  |  | $ 11,100 |  |
Period for recognition of cost not recognized (in years) |  |  | 1 year 8 months 12 days |  |
2014 Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Options available for grant (in shares) |  |  | 5,664,562 |  |
Contractual term (in years) |  |  | 10 years |  |
2014 Awards | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Grants in period (in shares) |  | 122,400 |  |  |
Shares categorized as vesting (percent) |  | 50.00% |  |  |
Share based compensation, fair market value |  | $ 3,200 |  |  |
Shares categorized as performance based (percent) |  | 50.00% |  |  |
Shares issued (shares) | 70,862 |  |  |  |
Fair value of shares issued | $ 4,100 |  |  |  |
Vesting period (in years) |  | 3 years |  |  |
Award vesting rights (in percentage) |  |  | 33.33% |  |
2014 Awards | Restricted Stock | Tranche One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Award vesting rights (in percentage) |  | 33.33% |  |  |
2014 Awards | Restricted Stock | Tranche Two |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Award vesting rights (in percentage) |  | 33.33% |  |  |
2014 Awards | Restricted Stock | Tranche Three |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Award vesting rights (in percentage) |  | 33.33% |  |  |
2014 Awards | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Grants in period (in shares) |  |  | 20,402 |  |
Share based compensation, fair market value |  |  | $ 1,100 |  |

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