Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 268,918	$ 187,509
Marketable securities	6,501	7,557
Tuition receivable, net	51,277	50,169
Income taxes receivable	313	1,429
Other current assets	40,777	39,458
Total current assets	367,786	286,122
Property and equipment, net	150,589	158,854
Right-of-use lease assets	149,587	120,687
Marketable securities, non-current	23,377	30,270
Intangible assets, net	276,380	326,420
Goodwill	1,285,864	1,318,526
Other assets	52,297	54,928
Total assets	2,305,880	2,295,807
Current liabilities:
Accounts payable and accrued expenses	95,518	104,742
Contract liabilities	73,232	60,501
Lease liabilities	27,005	34,809
Total current liabilities	195,755	200,052
Long-term debt	141,630	141,823
Deferred income tax liabilities	44,595	53,407
Lease liabilities, non-current	162,821	106,151
Other long-term liabilities	47,089	46,055
Total liabilities	591,890	547,488
Commitments and contingencies
Stockholders’ equity:
Common stock, par value $0.01; 32,000,000 shares authorized; 24,418,939 and 24,592,098 shares issued and outstanding at December 31, 2020 and 2021, respectively	246	244
Additional paid-in capital	1,529,969	1,519,549
Accumulated other comprehensive income	9,203	48,880
Retained earnings	174,572	179,646
Total stockholders’ equity	1,713,990	1,748,319
Total liabilities and stockholders’ equity	$ 2,305,880	$ 2,295,807