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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 65,930 $ 106,044 $ 131,260
Adjustments to reconcile net income to net cash provided by operating activities:      
Amortization of gain on sale of assets (281) (281) (281)
Amortization of deferred rent 323 1,177 275
Gain on sale of marketable securities    (66) (406)
Amortization of deferred financing costs 795 663   
Depreciation and amortization 23,973 21,525 17,309
Deferred income taxes (38) 3,722 353
Stock-based compensation 5,464 13,234 11,987
Changes in assets and liabilities:      
Tuition receivable, net 1,744 (2,995) (4,233)
Other current assets (2,130) (768) (1,153)
Other assets (135) 102 (258)
Accounts payable and accrued expenses 5,673 (3,360) 10,146
Income taxes payable and income taxes receivable (4,306) (1,279) (1,358)
Excess tax benefits from stock-based payment arrangements       (2,808)
Unearned tuition (14,870) 11,841 1,083
Other long-term liabilities (80) 4,804 905
Net cash provided by operating activities 82,062 154,363 162,821
Cash flows from investing activities:      
Purchases of property and equipment (24,733) (29,991) (46,015)
Purchases of marketable securities    (2) (559)
Proceeds from the sale of marketable securities    12,388 40,700
Acquisition of assets    (7,000)   
Net cash used in investing activities (24,733) (24,605) (5,874)
Cash flows from financing activities:      
Common dividends paid (47,328) (49,105) (44,541)
Proceeds from exercise of stock options       452
Excess tax benefits from stock-based payment arrangements       2,808
Repurchase of common stock (25,001) (202,664) (115,517)
Proceeds from revolving credit facility 63,000 120,000   
Payments on revolving credit facility (83,000) (100,000)   
Proceeds from term loan 47,500 100,000   
Payments on term loan (20,000) (2,500)   
Payment of deferred financing costs (2,120) (2,459)   
Net cash used in financing activities (66,949) (136,728) (156,798)
Net increase (decrease) in cash and cash equivalents (9,620) (6,970) 149
Cash and cash equivalents - beginning of year 57,137 64,107 63,958
Cash and cash equivalents - end of year 47,517 57,137 64,107
Non-cash transactions:      
Purchases of property and equipment included in accounts payable $ 529 $ 1,115 $ 5,508