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LONG-TERM DEBT - Convertible Notes (Details)
3 Months Ended 6 Months Ended
Apr. 15, 2020
USD ($)
$ / shares
Mar. 15, 2020
USD ($)
$ / shares
Feb. 04, 2020
USD ($)
Jan. 29, 2020
$ / shares
Sep. 30, 2020
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
$ / shares
Dec. 31, 2019
USD ($)
Apr. 30, 2016
USD ($)
Long-term debt                      
Face amount of debt           $ 278,849,781   $ 278,849,781     $ 25,000,000.0
Dividends Declared and Paid (in dollars per share) | $ / shares           $ 0.25 $ 0.10 $ 0.50 $ 0.20    
Closing share price (in dollars per share) | $ / shares           $ 16.26   $ 16.26      
Unamortized debt discount of notes           $ 6,791,358   $ 6,791,358      
Gain (Loss) on Extinguishment of Debt           504,544   1,141,481      
4.50% Convertible Senior Notes due 2020                      
Long-term debt                      
Face amount of debt   $ 75,000,000.0 $ 75,000,000.0                
Debt conversion amount     57,400,000                
Stated interest rate (as a percent)   4.50%               4.50%  
Debt instrument conversion ratio   14.5136                  
Conversion price per share (in dollars per share) | $ / shares   $ 68.90                  
Conversion price per share   14.5136                  
Proceeds from private placement     5,900,000                
Repurchase of notes     5,900,000                
Outstanding amount     11,700,000             $ 74,706,078  
3.875% Convertible Senior Notes due 2025                      
Long-term debt                      
Face amount of debt     17,600,000     $ 62,468,000   $ 62,468,000      
Debt conversion amount     $ 57,400,000                
Stated interest rate (as a percent)     3.875%     3.875%   3.875%      
Conversion price per share (in dollars per share) | $ / shares           $ 77.79   $ 77.79      
Proceeds from private placement     $ 11,700,000                
Outstanding amount     $ 75,000,000     $ 55,676,641   $ 55,676,641      
2025 Notes maturing on April 15, 2025                      
Long-term debt                      
Stated interest rate (as a percent) 3.875%                    
Debt instrument conversion ratio 12.7910                    
Conversion price per share (in dollars per share) | $ / shares $ 78.18                    
Conversion price per share 12.7910                    
Threshold principal amount for adjusted conversion price $ 1,000                    
Dividends Declared and Paid (in dollars per share) | $ / shares $ 0.13                    
Premium initial conversion price       20.00%              
Closing share price (in dollars per share) | $ / shares       $ 65.15              
Sinking fund provided           0   0      
Unamortized debt discount of notes           2,600,000   2,600,000      
Repurchase of notes           12,500,000   12,500,000      
Outstanding amount           62,500,000   62,500,000      
2025 Notes maturing on April 15, 2025 | Forecast                      
Long-term debt                      
Debt instrument conversion ratio         12.8551            
Conversion price per share (in dollars per share) | $ / shares         $ 77.79            
Conversion price per share         12.8551            
Convertible Debt                      
Long-term debt                      
Unamortized debt discount of notes           $ 6,800,000   $ 6,800,000