Share-based Compensation - Stock Options and Restricted Stock Activity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Stock options
Options Outstanding
Balance at beginning of period (in shares)	394,089	761,686
Exercised (in shares)	0	(11,314)
Lapsed or canceled (in shares)	(28,283)	(356,283)
Balance at end of period (in shares)	365,806	394,089
Options exercisable at end of period (in shares)	365,806	394,089
Weighted Average Exercise Price
Balance at beginning of year (in dollars per share)	$ 100.56	$ 105.76
Exercised (in dollars per share)	0	72.30
Lapsed or canceled (in dollars per share)	112.48	112.56
Balance at end of period (in dollars per share)	99.64	100.56
Options exercisable at end of period (in dollars per share)	$ 99.64	$ 100.56
Restricted Stock Awards
Summary of restricted stock
Balance at beginning of year (in shares)	3,459,363	3,337,545
Granted (in shares)	77,148	141,515
Canceled (in shares)	(9,075)	(19,697)
Balance at end of period (in shares)	3,527,436	3,459,363
Vested during the period (in shares)	116,862	122,759
Compensation expense	$ 1,920,738	$ 8,497,054
Total fair value of shares granted during the period	$ 5,931,470	$ 9,214,531