Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents, unrestricted		$ 32,029	$ 18,110
Restricted cash		337	789
Restricted short-term investments		4,320	5,070
Short-term investments		156,336	156,178
Total cash and cash equivalents, restricted cash and short-term investments		193,022	180,147
Student receivables, net of allowance for doubtful accounts of $21,571 and $20,533 as of September 30, 2018 and December 31, 2017, respectively		34,043	18,875
Receivables, other, net		2,445	1,163
Prepaid expenses		8,515	7,722
Inventories		894	1,112
Other current assets		1,122	1,319
Assets of discontinued operations		66	382
Total current assets		240,107	210,720
NON-CURRENT ASSETS:
Property and equipment, net of accumulated depreciation of $195,650 and $213,825 as of September 30, 2018 and December 31, 2017, respectively		29,977	33,230
Goodwill		87,356	87,356
Intangible assets, net of amortization of $1,400 as of both September 30, 2018 and December 31, 2017		7,900	7,900
Student receivables, net of allowance for doubtful accounts of $1,980 and $2,001 as of September 30, 2018 and December 31, 2017, respectively		2,230	2,548
Deferred income tax assets, net		86,910	98,084
Other assets		5,277	5,673
Assets of discontinued operations		1,596	1,585
TOTAL ASSETS	[1]	461,353	447,096
CURRENT LIABILITIES:
Accounts payable		12,646	8,515
Accrued expenses:
Payroll and related benefits		23,953	32,910
Advertising and marketing costs		11,733	9,245
Income taxes		2,062	2,185
Other		16,222	31,233
Deferred revenue		22,988	22,897
Liabilities of discontinued operations		2,013	5,701
Total current liabilities		91,617	112,686
NON-CURRENT LIABILITIES:
Deferred rent obligations		14,205	15,277
Other liabilities		15,884	22,143
Liabilities of discontinued operations			785
Total non-current liabilities		30,089	38,205
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; 85,159,221 and 84,279,533 shares issued, 69,760,992 and 69,117,803 shares outstanding as of September 30, 2018 and December 31, 2017, respectively		852	843
Additional paid-in capital		626,751	621,008
Accumulated other comprehensive loss		(271)	(164)
Accumulated deficit		(67,017)	(108,127)
Treasury stock, at cost; 15,398,229 and 15,161,730 shares as of September 30, 2018 and December 31, 2017, respectively		(220,668)	(217,355)
Total stockholders' equity		339,647	296,205
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY		$ 461,353	$ 447,096

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