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Performance Awards - Schedule of Performance Activity (Details) - 2014 EIP - Performance Awards
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount $ 4,505
Adjustments (131)
Forfeitures (234)
Payments 0
Adjusted Award Value 4,140
November 2015  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount 1,487
Adjustments (6)
Forfeitures (197)
Payments 0
Adjusted Award Value $ 1,284
Remaining Periods (in Months) to Vesting 4 months
November 2016  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount $ 1,434
Adjustments (39)
Forfeitures (37)
Payments 0
Adjusted Award Value $ 1,358
Remaining Periods (in Months) to Vesting 16 months
November 2017  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Grant Amount $ 1,584
Adjustments (86)
Forfeitures 0
Payments 0
Adjusted Award Value $ 1,498
Remaining Periods (in Months) to Vesting 28 months