Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents, unrestricted		$ 47,411	$ 32,394
Restricted cash		30,000	337
Short-term investments		234,415	196,428
Total cash and cash equivalents, restricted cash and short-term investments		311,826	229,159
Student receivables, net of allowance for doubtful accounts of $27,075 and $23,307 as of September 30, 2019 and December 31, 2018, respectively		29,913	28,751
Receivables, other, net		1,336	2,567
Prepaid expenses		7,645	7,771	[1]
Inventories		665	763
Other current assets		1,640	437
Total current assets		353,025	269,448
NON-CURRENT ASSETS:
Property and equipment, net of accumulated depreciation of $197,070 and $198,052 as of September 30, 2019 and December 31, 2018, respectively		26,698	30,048
Right of use asset		52,016
Goodwill		87,356	87,356
Intangible assets, net of amortization of $1,400 as of both September 30, 2019 and December 31, 2018		7,900	7,900
Student receivables, net of allowance for doubtful accounts of $1,922 and $1,529 as of September 30, 2019 and December 31, 2018, respectively		1,131	942
Deferred income tax assets, net		65,363	81,628
Other assets		5,140	4,993
Assets of discontinued operations		178	178
TOTAL ASSETS	[2]	598,807	482,493
CURRENT LIABILITIES:
Lease liability-operating		12,109
Accounts payable		11,044	9,195
Accrued expenses:
Payroll and related benefits		25,019	24,530
Advertising and marketing costs		11,896	9,300
Income taxes		1,675	1,472
Other		46,610	19,668	[1]
Deferred revenue		23,784	32,351
Liabilities of discontinued operations		3	536
Total current liabilities		132,140	97,052
NON-CURRENT LIABILITIES:
Lease liability-operating		54,904
Deferred rent obligations	[1]		12,745
Other liabilities		9,819	17,493	[1]
Total non-current liabilities		64,723	30,238
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; 85,876,510 and 85,173,686 shares issued, 70,312,424 and 69,772,910 shares outstanding as of September 30, 2019 and December 31, 2018, respectively		859	852
Additional paid-in capital		633,536	628,295
Accumulated other comprehensive gain (loss)		386	(298)
Accumulated deficit		(9,445)	(52,946)	[3]
Treasury stock, at cost; 15,564,086 and 15,400,776 shares as of September 30, 2019 and December 31, 2018, respectively		(223,392)	(220,700)
Total stockholders' equity		401,944	355,203
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		$ 598,807	$ 482,493

[1] Balances as of December 31, 2018 that related to prepaid rent, remaining lease obligations for vacated spaces and deferred rent obligations were offset with the ROU asset as of January 1, 2019.

[2] Total assets do not include intercompany receivable or payable activity between institutions and corporate and investments in subsidiaries.

[3] Certain leases resulted in a negative ROU asset upon transition to ASC 842 related to vacated spaces that had liabilities previously established. Those leases that resulted in a negative ROU asset were recorded as an adjustment, net of tax, to accumulated deficit within stockholders equity on our condensed consolidated balance sheet as of January 1, 2019.