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Equity Compensation Plans - Unrecognized Compensation Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2017
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period |  | $ 18,146
Equity grants |  | 14,223
Equity grant forfeitures |  | (758)
Equity compensation expense |  | (10,141)
Unrecognized Compensation Cost at End of Period |  | 21,470
Restricted Stock |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized Compensation Cost at End of Period |  | 3,000
Deferred Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation expense | $ (3,000) |
Unrecognized Compensation Cost at End of Period |  | 13,000
Performance Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation expense | $ (600) |
Unrecognized Compensation Cost at End of Period |  | 5,000
Incentive Plans | Restricted Stock |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period |  | 2,091
Equity grants |  | 2,247
Equity grant forfeitures |  | (286)
Equity compensation expense |  | (1,244)
Unrecognized Compensation Cost at End of Period |  | 2,808
Incentive Plans | Deferred Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period |  | 11,506
Equity grants |  | 8,797
Equity grant forfeitures |  | (472)
Equity compensation expense |  | (6,467)
Unrecognized Compensation Cost at End of Period |  | 13,364
Incentive Plans | Performance Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period |  | 4,549
Equity grants |  | 3,050
Equity grant forfeitures |  | 0
Equity compensation expense |  | (2,301)
Unrecognized Compensation Cost at End of Period |  | 5,298
Employee Stock Purchase Plan |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period |  | 0
Equity grants |  | 129
Equity grant forfeitures |  | 0
Equity compensation expense |  | (129)
Unrecognized Compensation Cost at End of Period |  | $ 0

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- Definition Allocated Share-based Compensation Expense, Including Restructuring + References No definition available. + Details
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- Definition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] + References No definition available. + Details
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- Definition Represents the amount of equity grant forfeitures during the period. + References No definition available. + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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