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Stock-Based Compensation (Additional Information) (Details) $ in Millions | 3 Months Ended | 60 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) offering_periods | Mar. 31, 2016 USD ($) | Mar. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received from exercise of stock options | $ 0.8 |  |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options, contractual term (years) | 10 years |  |
Stock options, grants in period, gross | shares |  |  | 0
Options exercised, total intrinsic value | $ 1.1 |  |
Performance-Based Restricted Stock |  |  |
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 (income) | $ (0.1) | $ 0.7 |
Performance-Based Restricted Stock | 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 | 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 (income) | $ 1.0 | 1.2 |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense (income) | $ 0.1 | $ 0.1 |
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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