Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 146,475	$ 120,409
Investments	98,031	61,295
Accounts receivable, net	78,811	77,413
Income tax receivable	1,316	2,788
Other current assets	12,889	11,368
Total current assets	337,522	273,273
Property and equipment, net	169,699	147,504
Right-of-use assets	92,454	72,719
Amortizable intangible assets, net	168,381	176,800
Goodwill	160,766	160,766
Other assets	1,641	1,687
Total assets	930,463	832,749
Current liabilities
Accounts payable	17,676	20,006
Accrued compensation and benefits	31,358	36,412
Accrued liabilities	26,725	22,473
Income taxes payable	10,250	12,167
Current portion of lease liability	11,024	8,648
Total current liabilities	97,033	99,706
Deferred income taxes, noncurrent	26,749	26,195
Other long-term liability	410	436
Lease liability, less current portion	88,257	68,793
Total liabilities	212,449	195,130
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value, 10,000 shares authorized; 0 shares issued and outstanding at December 31, 2023 and December 31, 2022
Common stock, $0.01 par value, 100,000 shares authorized; 53,970 and 53,830 shares issued and 29,953 and 31,058 shares outstanding at December 31, 2023 and December 31, 2022, respectively	540	538
Treasury stock, at cost, 24,017 and 22,772 shares of common stock at December 31, 2023 and December 31, 2022, respectively	(1,849,693)	(1,711,423)
Additional paid-in capital	322,512	309,310
Accumulated other comprehensive loss	(57)	(533)
Retained earnings	2,244,712	2,039,727
Total stockholders' equity	718,014	637,619
Total liabilities and stockholders' equity	$ 930,463	$ 832,749