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Equity Incentive Plans - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) metric shares | Dec. 31, 2018 metric shares | Dec. 31, 2017 metric shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 4 years |  |
Expiration period | 10 years |  |
Options granted (in shares) | 391,000 | 500,000 | 500,000
Options outstanding, number outstanding (in shares) | 1,590,000 |  |
Restricted Stock Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs related to awards | $ | $ 27.2 |  |
Expected weighted average period to recognize expense | 2 years 1 month 6 days |  |
Performance measurement | metric | 2 | 2 | 2
Granted (in shares) | 788,000 |  |
Restricted Stock Award | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
Award vesting rights (as percent) | 0.00% | 0.00% | 0.00%
Restricted Stock Award | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 4 years |  |
Award vesting rights (as percent) | 200.00% | 200.00% | 200.00%
Restricted Stock Award | Certain Employees and Executive Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 788,000 | 906,000 | 933,000
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation costs related to awards | $ | $ 2.2 |  |
Expected weighted average period to recognize expense | 2 years 6 months |  |
Performance Shares | Certain Employees and Executive Officers |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 250,000 | 352,500 | 352,500
Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Discount on purchase of Common Stock for employee from the current market price | 5.00% |  |
Capital shares reserved for future issuance | 750,000 |  |
Issuance of common stock (ESPP) (in shares) | 30,153 | 24,365 | 20,009
2014 Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized | 4,600,000 |  |
Tranche One | Restricted Stock Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) | 50.00% | 50.00% | 50.00%
Performance period | 3 years |  |
Tranche Two | Restricted Stock Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) | 50.00% | 50.00% | 50.00%

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