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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 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 | 20,911
Equity grant forfeitures | (303)
Equity compensation expense | (13,402)
Unrecognized Compensation Cost at End of Period | 32,328
Restricted Stock Awards |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized Compensation Cost at End of Period | 2,000
Restricted Stock Units |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized Compensation Cost at End of Period | 4,000
Deferred Stock Units |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized Compensation Cost at End of Period | 18,000
Performance Stock Units |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward] |
Unrecognized Compensation Cost at End of Period | 9,000
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 | (1,508)
Unrecognized Compensation Cost at End of Period | 1,990
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 | 4,233
Equity grant forfeitures | 0
Equity compensation expense | (773)
Unrecognized Compensation Cost at End of Period | 3,534
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 | 11,230
Equity grant forfeitures | (303)
Equity compensation expense | (7,558)
Unrecognized Compensation Cost at End of Period | 17,858
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 | 5,275
Equity grant forfeitures | 0
Equity compensation expense | (3,390)
Unrecognized Compensation Cost at End of Period | 8,946
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 | 173
Equity grant forfeitures | 0
Equity compensation expense | (173)
Unrecognized Compensation Cost at End of Period | $ 0

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