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Equity Compensation Plans - Unrecognized Compensation Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2016
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Unrecognized compensation cost at beginning of period | $ 23,608 | $ 23,608
Equity grants |  | 6,518
Equity grant forfeitures |  | (4,727)
Equity compensation (expense) income |  | (10,600)
Unrecognized Compensation Cost at End of Period |  | 14,799
Deferred Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation (expense) income | (3,000) |
Performance Stock Units |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |  |
Equity compensation (expense) income | (600) |
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 | 2,393 | 2,393
Equity grants |  | 1,753
Equity grant forfeitures |  | (1,351)
Equity compensation (expense) income |  | (451)
Unrecognized Compensation Cost at End of Period |  | 2,344
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 | 14,392 | 14,392
Equity grants |  | 4,641
Equity grant forfeitures |  | (1,167)
Equity compensation (expense) income |  | (7,922)
Unrecognized Compensation Cost at End of Period |  | 9,944
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 | 6,823 | 6,823
Equity grants |  | 0
Equity grant forfeitures |  | (2,209)
Equity compensation (expense) income |  | (2,134)
Unrecognized Compensation Cost at End of Period |  | 2,480
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 | 0
Equity grants |  | 124
Equity grant forfeitures |  | 0
Equity compensation (expense) income |  | (93)
Unrecognized Compensation Cost at End of Period |  | $ 31

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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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