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Compensation Plans - Textual (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 5,200,000 $ 3,300,000 $ 5,800,000
Deferred compensation equity     $ 14,748,118 20,331,890  
Deferred compensation arrangement, fully vested employee elected deferral period     5 years    
Deferred compensation liability, current and noncurrent     $ 33,241,952 $ 30,342,204  
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    
Common Shares available for awards (in shares)     222,657    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants issued (in dollars per share)     $ 115.32 $ 146.59 $ 195.00