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Stock-Based Compensation (Additional Information) (Details) | 3 Months Ended | 9 Months Ended | 54 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) offering_periods | Sep. 30, 2015 USD ($) | Sep. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options |  |  | $ 2,100,000 |  |
Deferred Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense (income) | $ 700,000 | $ 0 | $ 700,000 | $ 0 |
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
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 3.00% |  |
Compensation expense (income) |  | 100,000 |  | 200,000 |
Options exercised, total intrinsic value |  |  | $ 1,400,000 |  |
Performance-Based Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 12.00% |  |
Compensation expense (income) | 1,100,000 | 1,200,000 | $ 3,200,000 | 2,800,000 |
Restricted stock award program, measurement period (years) |  |  | 3 years |  |
Expected dividend yield (percent) |  |  | 0.00% |  |
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] |  |  |  |  |
Stock-based compensation, approximate forfeitures rate (percent) |  |  | 12.00% |  |
Compensation expense (income) | 1,600,000 | 1,300,000 | $ 4,300,000 | 3,800,000 |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense (income) | $ 100,000 | $ 100,000 | $ 300,000 | $ 300,000 |
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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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