Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Compensation Costs (Details)

v3.19.1
Stock-Based Compensation - Compensation Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 2,751 $ 9,886
Restricted stock awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 166 0
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 2,131 9,886
Performance stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 454 $ 0