Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents, unrestricted		$ 319,982	$ 105,684
Restricted cash		5,196	4,000
Total cash, cash equivalents and restricted cash		325,178	109,684
Short-term investments		174,213	300,676
Total cash and cash equivalents, restricted cash and short-term investments		499,391	410,360
Student receivables, gross		79,418	84,599
Allowance for credit losses		(36,385)	(39,917)
Student receivables, net		43,033	44,682
Receivables, other		1,692	2,873
Prepaid expenses		6,919	8,209
Inventories		904	596
Other current assets		2,514	341
Total current assets		554,453	467,061
NON-CURRENT ASSETS:
Property and equipment, net of accumulated depreciation of $113,711 and $101,380 as of December 31, 2021 and 2020, respectively	[1]	28,355	27,761
Right of use asset, net		36,664	44,773
Goodwill		162,579	118,312
Intangible assets, net of amortization of $8,662 and $4,178 as of December 31, 2021 and 2020, respectively		32,208	15,522
Student receivables, gross		4,242	3,533
Allowance for credit losses		(2,870)	(2,230)
Student receivables, net		1,372	1,303
Deferred income tax assets, net		25,114	40,351
Other assets		6,688	6,434
TOTAL ASSETS	[2]	847,433	721,517
CURRENT LIABILITIES:
Lease liability-operating		9,400	9,789
Accounts payable		10,838	13,259
Accrued expenses:
Payroll and related benefits		25,312	22,661
Advertising and marketing costs		8,690	10,249
Income taxes		211	1,402
Other		15,180	11,921
Deferred revenue		70,613	34,534
Total current liabilities		140,244	103,815
NON-CURRENT LIABILITIES:
Lease liability-operating		35,549	43,405
Other liabilities		21,530	18,390
Total non-current liabilities		57,079	61,795
STOCKHOLDERS' EQUITY:
Preferred stock, $0.01 par value; 1,000,000 shares authorized; none issued or outstanding
Common stock, $0.01 par value; 300,000,000 shares authorized; 88,724,438 and 87,264,910 shares issued, 68,748,662 and 70,062,364 shares outstanding as of December 31, 2021 and 2020, respectively		887	873
Additional paid-in capital		674,242	658,423
Accumulated other comprehensive (loss) income		(96)	364
Retained earnings		251,972	142,335
Treasury stock, at cost, 19,975,776 and 17,202,546 shares as of December 31, 2021 and 2020, respectively		(276,895)	(246,088)
Total stockholders' equity		650,110	555,907
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		$ 847,433	$ 721,517

[1] Property and equipment which were fully depreciated and no longer in use by the Company were retired during the years ended December 31, 2021 and 2020; therefore, both the cost of the asset and the related accumulated depreciation balances were reduced to zero for these assets.

[2] Total assets are presented on a consolidated basis and do not include intercompany receivable or payable activity between institutions and corporate and investments in subsidiaries.