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Stock-Based Compensation Plans (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
plan
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
plan
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation expense     $ 15,960,362 $ 10,139,148    
Compensation expense for share-based payments $ 9,641,353 $ 5,200,045   9,986,839    
Employee Severance            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense for share-based payments 4,173,710          
Omnibus Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares) | shares           45,000,000
Shares issued under the Omnibus plan | shares     8,458,942      
Employee Stock Option Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost 6,882,606   $ 6,882,606      
Employee Stock Option Plan | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Option vesting period     1 year      
Option expiration period     5 years      
Employee Stock Option Plan | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Option vesting period     5 years      
Option expiration period     10 years      
Restricted Stock Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost 43,352,020   $ 43,352,020      
Restricted period, maximum     10 years      
Amortization expense 7,580,492 $ 3,274,411 $ 11,905,749 $ 6,046,175    
Restricted Stock Plan | Employee Severance            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Amortization expense $ 4,148,477          
Employee Stock Purchase Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares approved (in shares) | shares 2,000,000   2,000,000      
ESPP discount rate     85.00%      
ESPP discount rate recognized as compensation expense     15.00%      
Shares granted (in shares) | shares 1,269,603   1,269,603      
Equity Incentive Plans            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of plans | plan 2   2      
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost $ 4,932,401   $ 4,932,401      
Amortization expense $ 563,783   $ 957,560   $ 0