Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 600,941	$ 245,769
Investments	0	10,840
Accounts receivable, net	70,063	62,189
Interest receivable on Secured Note		5,011
Income tax receivable	1,275	1,294
Other current assets	8,766	8,639
Total current assets	681,045	333,742
Property and equipment, net	136,120	128,657
Right-of-use assets	57,652	61,020
Secured Note receivable, net		964,912
Amortizable intangible assets, net	185,219	193,638
Goodwill	160,766	160,766
Other assets	1,943	1,844
Total assets	1,222,745	1,844,579
Current liabilities
Accounts payable	24,306	16,583
Accrued compensation and benefits	32,714	34,248
Accrued liabilities	27,593	21,945
Income taxes payable	5,895	5,405
Deferred revenue	10
Current portion of lease liability	7,426	7,393
Current portion of notes payable		33,144
Total current liabilities	97,944	118,718
Deferred income taxes, noncurrent	25,962	20,288
Other long-term liability	37	3
Lease liability, less current portion	53,755	56,611
Notes payable, less current portion		74,630
Total liabilities	177,698	270,250
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value, 10,000 shares authorized; 0 shares issued and outstanding at December 31, 2021 and December 31, 2020
Common stock, $0.01 par value, 100,000 shares authorized; 53,637 and 53,277 shares issued and 37,722 and 46,649 shares outstanding at December 31, 2021 and December 31, 2020, respectively	536	533
Treasury stock, at cost, 15,915 and 6,628 shares of common stock at December 31, 2021 and December 31, 2020, respectively	(1,107,211)	(303,379)
Additional paid-in capital	296,670	282,467
Retained earnings	1,855,052	1,594,708
Total stockholders' equity	1,045,047	1,574,329
Total liabilities and stockholders' equity	$ 1,222,745	$ 1,844,579