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Share-Based Payments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2015
Sep. 23, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Recognized stock-based compensation expense $ 4,014 $ 3,461 $ 7,356 $ 7,252    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense 1,400   1,400      
RSU [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense $ 22,600   $ 22,600      
LTIP [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of issued and outstanding shares of common stock provides for grants of restricted common stock, restricted stock units and other equity-based awards           7.50%
Common stock, shares delivered     345,996      
LTIP [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock units vested         10,394  
LTIP [Member] | RSU [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock units vested     603,677   0  
Adjustments to additional paid in capital, income tax deficiency from share-based compensation     $ 4,700