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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
CURRENT ASSETS: |  |
Cash and cash equivalents, unrestricted | $ 165,921 | $ 240,559
Restricted cash | 11,966 | 97,878
Short-term investments | 63,947 | 63,876
Total cash and cash equivalents and short-term investments | 241,834 | 402,313
Student receivables, net of allowance for doubtful accounts of $31,813 and $35,111 as of June 30, 2013 and December 31, 2012, respectively | 53,518 | 68,798
Receivables, other, net | 40,453 | 3,837
Prepaid expenses | 96,436 | 44,297
Inventories | 7,690 | 8,471
Deferred income tax assets, net | 7,129 | 7,095
Other current assets | 7,245 | 4,422
Assets of discontinued operations | 3,705 | 4,328
Total current assets | 458,010 | 543,561
NON-CURRENT ASSETS: |  |
Property and equipment, net | 246,008 | 277,302
Goodwill | 132,389 | 133,025
Intangible assets, net | 56,895 | 61,670
Student receivables, net of allowance for doubtful accounts of $9,177 and $11,982 as of June 30, 2013 and December 31, 2012, respectively | 6,029 | 6,832
Deferred income tax assets, net | 47,936 | 47,707
Other assets, net | 28,149 | 33,280
Assets of discontinued operations | 18,772 | 19,326
TOTAL ASSETS | 994,188 | 1,122,703
CURRENT LIABILITIES: |  |
Short-term borrowings and current maturities of capital lease obligations |  | 80,211
Accounts payable | 31,863 | 38,416
Accrued expenses: |  |
Payroll and related benefits | 46,414 | 46,586
Advertising and production costs | 22,630 | 20,963
Other | 83,483 | 44,585
Deferred tuition revenue | 80,945 | 111,896
Liabilities of discontinued operations | 13,522 | 10,058
Total current liabilities | 278,857 | 352,715
NON-CURRENT LIABILITIES: |  |
Deferred rent obligations | 91,415 | 95,073
Other liabilities | 29,331 | 29,799
Liabilities of discontinued operations | 24,844 | 33,326
Total non-current liabilities | 145,590 | 158,198
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; 81,808,424 and 81,616,987 shares issued, 67,090,083 and 67,069,734 shares outstanding as of June 30, 2013 and December 31, 2012, respectively | 818 | 816
Additional paid-in capital | 600,796 | 596,826
Accumulated other comprehensive loss | (3,712) | (4,785)
Retained earnings | 186,328 | 232,921
Cost of 14,718,341 and 14,547,253 shares in treasury as of June 30, 2013 and December 31, 2012, respectively | (214,489) | (213,988)
Total stockholders' equity | 569,741 | 611,790
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 994,188 | $ 1,122,703

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