CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 20,204	$ 45,941	$ 2,932	$ 106,586
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	7,351	7,695	14,643	15,115
Provision for doubtful accounts	14,924	13,434	30,229	24,088
Deferred income taxes	1,484	(6,490)	(13,899)	(10,714)
Excess tax benefit from stock option exercises	0	(574)	0	(1,379)
Stock-based compensation expense	2,301	4,272	5,394	8,755
Settlement cost	0	0	(46,000)	0
Provision for PEAKS Trust student loan losses	4,319	0	4,319	0
Loss on consolidation of PEAKS Trust	0	0	73,248	0
Other	71	96	365	(243)
Changes in operating assets and liabilities:
Restricted cash	874	842	(638)	485
Accounts receivable	(34,543)	(33,006)	(77,228)	(50,527)
PEAKS Trust student loans	3,392	0	4,579	0
Accounts payable	6	3,113	415	1,901
Other operating assets and liabilities	(2,121)	(14,875)	(8,032)	8,761
Deferred revenue	(6,737)	(58,274)	(22,009)	(104,670)
Net cash flows from operating activities	8,802	(37,826)	(35,113)	(1,842)
Cash flows from investing activities:
Facility expenditures and land purchases	(360)	(253)	(460)	(385)
Capital expenditures, net	(1,955)	(7,117)	(3,373)	(11,635)
Proceeds from sales and maturities of investments and repayment of notes	107	117,216	322	216,171
Purchase of investments and note advances	0	0	(1,241)	(63,545)
Net cash flows from investing activities	(2,208)	109,846	(4,752)	140,606
Cash flows from financing activities:
Excess tax benefit from stock option exercises	0	574	0	1,379
Proceeds from exercise of stock options	0	3,423	0	8,091
Debt issue costs	0	0	0	(1,525)
Proceeds from revolving borrowings	0	0	0	175,000
Repayment of revolving borrowings	(30,000)	(25,000)	(20,000)	(175,000)
Repayment of PEAKS Trust senior debt	(661)	0	(661)	0
Repurchase of common stock and shares tendered for taxes	(3)	(61,789)	(371)	(209,360)
Net cash flows from financing activities	(30,664)	(82,792)	(21,032)	(201,415)
Net change in cash and cash equivalents	(24,070)	(10,772)	(60,897)	(62,651)
Cash and cash equivalents at beginning of period	206,638	171,970	243,465	223,849
Cash and cash equivalents at end of period	182,568	161,198	182,568	161,198
PEAKS Trust Student Loans [Member]
Adjustments to reconcile net income to net cash flows from operating activities:
Accretion of discount on PEAKS Trust	(4,104)	0	(5,464)	0
Provision for PEAKS Trust student loan losses	4,319		4,319
Loss on consolidation of PEAKS Trust			73,248
PEAKS Trust senior debt [Member]
Adjustments to reconcile net income to net cash flows from operating activities:
Accretion of discount on PEAKS Trust	$ 1,381	$ 0	$ 2,033	$ 0