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Share-Based Payments - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Apr. 16, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 3,889 $ 4,048 $ 12,084 $ 11,404    
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense 300   300      
RSU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense $ 19,500   $ 19,500      
LTIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)         7,000,000  
Common stock, shares delivered 159 514 433,585 346,510    
LTIP | RSU            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock units vested 263 807 730,980 604,484    
Adjustments to additional paid in capital, income tax deficiency from share-based compensation     $ 5,000 $ 4,700    
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share price (in dollars per share)           $ 16.66
Common stock, shares delivered 159 514 460,830 374,580