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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized compensation cost at beginning of period | $ 25,122
Equity grants | 8,474
Equity grant forfeitures | 0
Equity compensation expense | (10,132)
Unrecognized Compensation Cost at End of Period | 23,464
Incentive Plans | Restricted Stock Awards |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized compensation cost at beginning of period | 3,498
Equity grants | 0
Equity grant forfeitures | 0
Equity compensation expense | (1,137)
Unrecognized Compensation Cost at End of Period | 2,361
Incentive Plans | Restricted Stock Units |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized compensation cost at beginning of period | 74
Equity grants | 3,483
Equity grant forfeitures | 0
Equity compensation expense | (499)
Unrecognized Compensation Cost at End of Period | 3,058
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 | 14,489
Equity grants | 4,831
Equity grant forfeitures | 0
Equity compensation expense | (5,871)
Unrecognized Compensation Cost at End of Period | 13,449
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 | 7,061
Equity grants | 0
Equity grant forfeitures | 0
Equity compensation expense | (2,505)
Unrecognized Compensation Cost at End of Period | 4,556
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 | 160
Equity grant forfeitures | 0
Equity compensation expense | (120)
Unrecognized Compensation Cost at End of Period | $ 40

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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 Amount of cost capitalized for award under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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