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Stock-based Compensation - Stock Options (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 07, 2014 shares | Dec. 31, 2019 USD ($) item $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Equity Incentive Plan 2010 |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Shares included in the authorized shares which was previously reserved for issuance |  | 283,976 |  |  |
Shares |  |  |  |  |
Granted (in shares) | 0 |  |  |  |
Equity Incentive Plan 2014 |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of shares authorized |  | 5,283,976 |  |  |
Employee and Directors Stock Options |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Term of award |  | 10 years |  |  |
Vesting period |  | 3 years |  |  |
Stock-based compensation | $ |  | $ 0 | $ 0 | $ 0 |
Unrecognized compensation cost | $ |  | $ 0 | $ 0 | $ 0 |
Shares |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 2,620,295 | 2,858,158 | 3,308,158 |
Exercised (in shares) |  | (2,256,142) | (237,863) | (450,000) |
Balance at the end of the period (in shares) |  | 364,153 | 2,620,295 | 2,858,158 | 3,308,158
Vested and exercisable at the end of the period (in shares) |  | 364,153 |  |  |
Exercise Price |  |  |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares |  | $ 20.40 | $ 20.37 | $ 20.40 |
Exercised (in dollars per share) | $ / shares |  | 20.00 | 20.00 | 20.59 |
Balance at the end of the period (in dollars per share) | $ / shares |  | 22.90 | $ 20.40 | $ 20.37 | $ 20.40
Vested and exercisable at the end of the period (in dollars per share) | $ / shares |  | $ 22.90 |  |  |
Remaining Contractual Term |  |  |  |  |
Remaining Contractual Term (in years) |  | 9 months | 1 year 5 months 26 days | 2 years 5 months 26 days | 3 years 6 months
Vested and exercisable |  | 9 months |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Balance at the beginning of the period | $ |  | $ 25,697 | $ 79,230 | $ 46,086 |
Exercised | $ |  | 46,358 | 5,505 | 9,397 |
Balance at the end of the period | $ |  | 8,965 | 25,697 | 79,230 | $ 46,086
Vested and exercisable at the end of the period | $ |  | $ 8,965 |  |  |
Restricted Stock Units |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of different vesting criteria | item |  | 4 |  |  |
Stock-based compensation | $ |  | $ 20,700 | $ 17,500 | $ 19,800 |
Unrecognized compensation cost | $ |  | $ 23,500 |  |  |
Number of shares granted |  | 1,254,904 |  |  |
Restricted Stock Units | Vesting Tranche One |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 3 years |  |  |
Restricted Stock Units | Minimum | Vesting Tranche Two |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 1 year |  |  |
Restricted Stock Units | Maximum | Vesting Tranche Two |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 2 years |  |  |
Restricted Stock With Book Value Conditions |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Number of types of book value RSUs | item |  | 2 |  |  |
Restricted Stock With Book Value Conditions | Vesting Tranche One |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 3 years |  |  |
Restricted Stock With Book Value Conditions | Vesting Tranche Two |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 3 years |  |  |
Restricted Stock With Book Value Conditions | Minimum | Vesting Tranche Two |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Percentage of shares vested |  | 0.00% |  |  |
Restricted Stock With Book Value Conditions | Maximum | Vesting Tranche Two |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Percentage of shares vested |  | 200.00% |  |  |
Restricted Stock With Total Shareholder Return Conditions |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Vesting period |  | 3 years |  |  |
Percentage of shares vested |  | 100.00% |  |  |
Number of shares granted |  | 429,312 |  |  |
Restricted Stock With Total Shareholder Return Conditions | Minimum |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Percentage of shares vested |  | 0.00% |  |  |
Restricted Stock With Total Shareholder Return Conditions | Maximum |  |  |  |  |
Stock-based Compensation |  |  |  |  |
Percentage of shares vested |  | 200.00% |  |  |

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