Stock-Based Compensation Plans (Narrative) (Details)	12 Months Ended				108 Months Ended
	Dec. 31, 2021 USD ($) plan shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2013 shares	Dec. 31, 2021 USD ($) plan shares	Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, granted (in shares)	1,099,000	833,000	1,133,000
Number of shares outstanding	3,760,000	3,599,000	3,315,000		3,760,000	2,638,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)				2,000,000
Shares, granted (in shares)	143,892	208,273	173,013		1,498,021
Amortization expense | $	$ 713,912	$ 810,605	$ 647,988
ESPP discount rate				85.00%
Discount recognized as compensation expense				15.00%
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan	2				2
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan	2				2
Stock option expense | $	$ 5,780,959	4,935,527	6,345,147
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $	6,416,607				$ 6,416,607
Amortization expense | $	$ 1,573,831	4,424,678	897,136
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)	45,000,000				45,000,000
Shares issued under plan (in shares)	15,634,656				15,634,656
Options granted net of shares from canceled/expired options (in shares)	3,443,588
Restricted period, maximum, in years	10 years
Shares, granted (in shares)	2,582,553
Shares outstanding (in shares)	3,760,468
Omnibus Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period	1 year
Award expiration period	5 years
Omnibus Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period	5 years
Award expiration period	10 years
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)	24,000,000				24,000,000
Options granted net of shares from canceled/expired options (in shares)	12,734,438
Unrecognized compensation cost | $	$ 9,324,372				$ 9,324,372
Weighted-average period for unrecognized compensation cost expected to be recognized	2 years 29 days
Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)	9,000,000				9,000,000
Shares, granted (in shares)	5,630,019
Unearned stock-based compensation | $	$ 46,009,313				$ 46,009,313
Amortization expense | $	$ 19,304,013	$ 20,675,447	$ 13,770,917