CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 206,638	$ 243,465	$ 171,970
Short-term investments	0	0	114,806
Restricted cash	6,693	3,478	7,629
Accounts receivable, net	106,308	78,928	55,475
PEAKS Trust student loans, less allowance for loan losses of $0, $0 and $0	7,282	0	0
Deferred income taxes	71,301	44,547	12,566
Prepaid expenses and other current assets	19,189	16,162	17,832
Total current assets	417,411	386,580	380,278
Property and equipment, net	184,123	189,890	198,493
PEAKS Trust student loans, excluding current portion, less allowance for loan losses of $0, $0 and $0	105,007	0	0
Deferred income taxes	45,024	57,471	34,563
Other assets	31,721	41,263	49,516
Total assets	783,286	675,204	662,850
Current liabilities:
Current portion of PEAKS Trust senior debt	103,356	0	0
Accounts payable	63,713	63,304	77,664
Accrued compensation and benefits	15,425	21,023	13,323
Other current liabilities	52,185	106,796	60,641
Deferred revenue	120,628	135,900	180,147
Total current liabilities	355,307	327,023	331,775
Long-term debt	150,000	140,000	175,000
PEAKS Trust senior debt, excluding current portion	123,660	0	0
Other liabilities	45,634	82,416	64,574
Total	674,601	549,439	571,349
Shareholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, none issued	0	0	0
Common stock, $.01 par value, 300,000,000 shares authorized, 37,068,904 issued	371	371	371
Capital surplus	194,629	197,113	186,262
Retained earnings	950,202	967,473	891,875
Accumulated other comprehensive (loss)	(7,835)	(7,930)	(9,316)
Treasury stock, 13,706,781, 13,744,395 and 12,934,377 shares, at cost	(1,028,682)	(1,031,262)	(977,691)
Total shareholders' equity	108,685	125,765	91,501
Total liabilities and shareholders' equity	$ 783,286	$ 675,204	$ 662,850