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Share-Based Payments - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 23, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Recognized stock-based compensation expense $ 4,048,000 $ 2,635,000 $ 11,404,000 $ 9,887,000  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense 1,100,000   1,100,000    
RSU [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense $ 19,600,000   $ 19,600,000    
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 514   346,510    
LTIP [Member] | RSU [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units vested 807   604,484    
Adjustments to additional paid in capital, income tax deficiency from share-based compensation $ 0   $ 4,700,000