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Equity Based Plans - Summary of Cumulative Summary of Equity Plans (Details) - shares
Dec. 31, 2018
Mar. 17, 2016
Mar. 16, 2016
Share-based Compensation [Abstract]      
Authorized (in shares) 2,700,000    
Restricted stock issued (in shares) 1,346,293    
Outstanding stock options (in shares) 0    
Stock options exercised (in shares) 918,091    
Stock options exercisable (in shares) 0    
Shares available for grant (in shares) 399,584    
Amended 1999 Plan [Member]      
Share-based Compensation [Abstract]      
Authorized (in shares) 600,000    
Restricted stock issued (in shares) 416,402    
Outstanding stock options (in shares) 0    
Stock options exercised (in shares) 139,791    
Stock options exercisable (in shares) 0    
Shares available for grant (in shares) 7,775    
Amended 2003 Plan [Member]      
Share-based Compensation [Abstract]      
Authorized (in shares) 2,100,000 2,100,000 1,750,000
Restricted stock issued (in shares) 929,891    
Outstanding stock options (in shares) 0    
Stock options exercised (in shares) 778,300    
Stock options exercisable (in shares) 0    
Shares available for grant (in shares) 391,809