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Compensation Plans - Textual (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred compensation equity   $ 22,008,054 $ 22,008,054 $ 19,134,963
Deferred compensation liability, current and noncurrent   $ 22,387,874 $ 22,387,874 $ 20,480,790
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred compensation arrangement, fully vested employee elected deferral period     5 years  
401K        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Defined contribution plan, employer matching contribution, percent of match 200.00% 250.00%    
Employee's compensation contributed to the plan 6.00% 6.00%    
Number of years of employment required to vest in contribution     6 years  
2011 Equity and Cash Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorizes the issuance of Common Shares in various forms of equity awards (in shares)   600,000 600,000  
Common Shares available for awards (in shares)   287,354 287,354