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Capital Stock and Equity Compensation (Additional Information) (Details) | 3 Months Ended | 84 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) offering_periods | Mar. 31, 2018 USD ($) | Mar. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Proceeds from the exercise of stock options, net | $ 285,000 | $ 473,000 |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0 | 0 |
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 | $ 900,000 |  |
Options exercised, total intrinsic value | $ 300,000 |  |
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 | $ 900,000 | 1,000,000 |
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% |  |
Time Based Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 1,500,000 | $ 1,500,000 |
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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