Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents, unrestricted		$ 105,684	$ 108,687
Restricted cash		4,000
Total cash, cash equivalents and restricted cash		109,684	108,687
Short-term investments		300,676	185,488
Total cash and cash equivalents, restricted cash and short-term investments		410,360	294,175
Student receivables, gross		84,599	84,874
Allowance for credit losses		(39,917)	(29,856)
Student receivables, net		44,682	55,018
Receivables, other		2,873	1,381
Prepaid expenses		8,209	7,299
Inventories		596	576
Other current assets		341	1,936
Total current assets		467,061	360,385
NON-CURRENT ASSETS:
Property and equipment, net of accumulated depreciation of $101,380 and $92,933 as of December 31, 2020 and 2019, respectively	[1]	27,761	26,006
Right of use asset, net		44,773	50,366
Goodwill		118,312	87,356
Intangible assets, net of amortization of $4,178 and $1,400 as of December 31, 2020 and 2019, respectively		15,522	7,900
Student receivables, gross		3,533	3,352
Allowance for credit losses		(2,230)	(2,108)
Student receivables, net		1,303	1,244
Deferred income tax assets, net		40,351	60,169
Other assets		6,434	5,720
TOTAL ASSETS	[2]	721,517	599,146
CURRENT LIABILITIES:
Lease liability-operating		9,789	11,784
Accounts payable		13,259	11,533
Accrued expenses:
Payroll and related benefits		22,661	27,616
Advertising and marketing costs		10,249	10,479
Income taxes		1,402	1,376
Other		11,921	16,378
Deferred revenue		34,534	24,647
Total current liabilities		103,815	103,813
NON-CURRENT LIABILITIES:
Lease liability-operating		43,405	52,391
Other liabilities		18,390	11,647
Total non-current liabilities		61,795	64,038
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; 87,264,910 and 85,953,253 shares issued, 70,062,364 and 70,151,357 shares outstanding as of December 31, 2020 and 2019, respectively		873	860
Additional paid-in capital		658,423	639,335
Accumulated other comprehensive income		364	344
Retained earnings		142,335	18,071
Treasury stock, at cost, 17,202,546 and 15,801,896 shares as of December 31, 2020 and 2019, respectively		(246,088)	(227,315)
Total stockholders' equity		555,907	431,295
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		$ 721,517	$ 599,146

[1] Property and equipment which were fully depreciated and no longer in use by the Company were retired during the years ended December 31, 2020 and 2019; 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.