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Stock-Based Compensation (Additional Information) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) offering_period | Sep. 30, 2014 USD ($)
Employee Stock Purchase Plan [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Compensation expense (income) | $ 100,000 | $ 100,000 | $ 300,000 | $ 300,000
Employee stock purchase plan, number of offering (offering period) | offering_period |  |  | 2 |
Employee stock purchase plan, offering period (months) |  |  | 6 months |
Employee stock purchase plan, purchase price discount (percent) |  |  | 15.00% |
Stock Options [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Stock options, contractual term (years) |  |  | 10 years |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 3.00% |
Compensation expense (income) | 100,000 | 100,000 | $ 200,000 | 300,000
Options exercised, total intrinsic value |  |  | 6,900,000 |
Total amount of cash received from exercise of options |  |  | $ 6,500,000 |
Performance-Based Restricted Stock [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 7.00% |
Compensation expense (income) | $ 1,200,000 | 200,000 | $ 2,800,000 | 1,500,000
Restricted stock award program, measurement period (years) |  |  | 3 years |
Expected dividend yield (percent) |  |  | 0.00% |
Restricted stock award program, payment of award as percentage of target (percent) | 120.00% |  | 120.00% |
Performance-Based Restricted Stock [Member] | Minimum [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 0.00% |
Performance-Based Restricted Stock [Member] | Maximum [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Restricted stock award program, awarded shares as a percentage of the original award amount (percent) |  |  | 200.00% |
Time Based Restricted Stock [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 7.00% |
Compensation expense (income) | $ 1,300,000 | 700,000 | $ 3,800,000 | 2,700,000
Time Based Restricted Stock [Member] | 2011 Grants [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Restricted stock award program, vesting period (years) |  |  | 4 years |
Time Based Restricted Stock [Member] | 2012 Grants [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Restricted stock award program, vesting period (years) |  |  | 3 years |
Deferred Stock Units [Member] |  |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |  |
Compensation expense (income) | $ 0 | $ 0 | $ 700,000 | $ 800,000

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