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Capital Stock and Equity Compensation (Additional Information) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 87 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) offering_periods | Jun. 30, 2018 USD ($) | Jun. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Proceeds from the exercise of stock options, net |  |  | $ 327 | $ 698 |
Performance-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, measurement period (years) |  |  | 3 years |  |
Expected dividend yield (percent) |  |  | 0.00% |  |
Compensation expense | $ 1,100 | $ 800 | $ 2,000 | 1,800 |
Performance-Based Restricted Stock Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 0.00% |  |
Performance-Based Restricted Stock Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 200.00% |  |
Deferred Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense | 1,100 | 900 | $ 1,100 | 900 |
Conversion ratio |  |  | 1 |  |
Time-Based Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense | $ 1,400 | $ 1,300 | $ 2,900 | $ 2,900 |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options, contractual term (years) |  |  | 10 years |  |
Stock options, number of shares granted in period, gross | shares |  |  |  |  | 0
Proceeds from the exercise of stock options, net |  |  | $ 1,100 |  |
Options exercised, total intrinsic value |  |  | $ 300 |  |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock purchase plan, number of offering (offering period) | offering_periods |  |  | 2 |  |
Employee stock purchase plan, offering period (months) |  |  | 6 months |  |
Employee stock purchase plan, purchase price discount (percent) |  |  | 15.00% |  |

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