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Stock-Based Compensation Plans (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
plan
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
plan
shares
Jun. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense for share-based payments $ 6,727,513 $ 9,641,353 $ 12,622,158 $ 15,960,362
Omnibus Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total grants in period (in shares) | shares     5,735,302  
Shares issued under the Omnibus plan | shares     14,332,742  
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 $ 8,999,790   $ 8,999,790  
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 50,874,177   $ 50,874,177  
Restricted period, maximum     10 years  
Amortization expense $ 4,459,401 7,580,492 $ 8,762,376 11,905,749
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 | 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 1,423,819   1,423,819  
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 $ 9,456,469   $ 9,456,469  
Amortization expense $ 701,524 $ 563,783 $ 805,754 $ 957,560