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Stock-Based Compensation Plans (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
plan
shares
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
plan
shares
Sep. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense for share-based payments $ 7,492,763 $ 6,904,725   $ 20,114,921 $ 22,865,087
Employee Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued under the Omnibus plan | shares       1,463,744  
Number of shares authorized | shares 2,000,000     2,000,000  
ESPP discount rate       85.00%  
ESPP discount rate recognized as compensation expense       15.00%  
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]          
Total grants in period (in shares) | shares       6,156,962  
Shares issued under the Omnibus plan | shares       15,031,810  
Number of shares authorized | shares 45,000,000     45,000,000  
Employee Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 9,556,647     $ 9,556,647  
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 48,175,427     $ 48,175,427  
Restricted period, maximum       10 years  
Amortization expense $ 5,215,981 4,366,025   $ 13,978,358 16,271,774
Restricted Stock Plan | Employee Severance          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amortization expense     $ 4,148,477    
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 $ 7,967,733     $ 7,967,733  
Amortization expense $ 581,830 $ 1,403,799   $ 1,387,584 $ 2,361,359