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Performance Awards - Schedule of Performance Activity (Details) - 2014 EIP - Performance Awards
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount $ 4,505
Adjustments 490
Forfeitures (234)
Payments 0
Adjusted Award Value 4,761
November 2015  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount 1,487
Adjustments 627
Forfeitures (197)
Payments 0
Adjusted Award Value $ 1,917
Remaining Periods (in Months) to Vesting 7 months
November 2016  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount $ 1,434
Adjustments (46)
Forfeitures (37)
Payments 0
Adjusted Award Value $ 1,351
Remaining Periods (in Months) to Vesting 19 months
November 2017  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount $ 1,584
Adjustments (91)
Forfeitures 0
Payments 0
Adjusted Award Value $ 1,493
Remaining Periods (in Months) to Vesting 31 months