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Performance Awards - Summary of Grant Activity (Details) - 2014 EIP - Performance Awards
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Amount $ 6,095
Adjustments (196)
Forfeitures (234)
Payments (1,290)
Adjusted Award Value at December 31, 2018 4,375
November 2015  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Amount 1,487
Adjustments 0
Forfeitures (197)
Payments (1,290)
Adjusted Award Value at December 31, 2018 $ 0
Remaining Periods (in Months) to Vesting 0 months
November 2016  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Amount $ 1,434
Adjustments (27)
Forfeitures (37)
Payments 0
Adjusted Award Value at December 31, 2018 $ 1,370
Remaining Periods (in Months) to Vesting 10 months
November 2017  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Amount $ 1,584
Adjustments (66)
Forfeitures 0
Payments 0
Adjusted Award Value at December 31, 2018 $ 1,518
Remaining Periods (in Months) to Vesting 22 months
November 2018  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Amount $ 1,590
Adjustments (103)
Forfeitures 0
Payments 0
Adjusted Award Value at December 31, 2018 $ 1,487
Remaining Periods (in Months) to Vesting 34 months