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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized compensation cost at beginning of period | $ 21,470
Equity grants | 7,627
Equity grant forfeitures | (112)
Equity compensation expense | (9,565)
Unrecognized Compensation Cost at End of Period | 19,420
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 | 2,808
Equity grants | 2,391
Equity grant forfeitures | (112)
Equity compensation expense | (1,245)
Unrecognized Compensation Cost at End of Period | 3,842
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 | 13,364
Equity grants | 4,750
Equity grant forfeitures | 0
Equity compensation expense | (6,264)
Unrecognized Compensation Cost at End of Period | 11,850
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 | 5,298
Equity grants | 350
Equity grant forfeitures | 0
Equity compensation expense | (1,954)
Unrecognized Compensation Cost at End of Period | 3,694
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 | 136
Equity grant forfeitures | 0
Equity compensation expense | (102)
Unrecognized Compensation Cost at End of Period | $ 34

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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