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Stock-Based Compensation Stock-Based Compensation Grant Date Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options granted (shares) 210,000 400,000
Stock options granted, grant date fair value $ 504 $ 1,055
Equity grants in period (shares) 467,591 1,044,520
Equity grants in period, grant date fair value $ 2,358 $ 6,180
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants other than options (shares) 183,403 516,955
Grants other than options, grant date fair value $ 1,374 $ 4,198
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants other than options (shares) 74,188 108,188
Grants other than options, grant date fair value $ 480 $ 753
Performance-Based Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants other than options (shares)   19,377
Grants other than options, grant date fair value   $ 174