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Unaudited Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 14,783 $ 17,231
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of gain on sale of assets (70) (70)
Amortization of deferred rent (199) 27
Amortization of deferred financing costs 195 195
Depreciation and amortization 5,803 6,190
Deferred income taxes (602) (661)
Stock-based compensation 1,961 2,250
Changes in assets and liabilities:    
Tuition receivable, net 1,338 1,081
Other current assets 926 1,645
Other assets    (4)
Accounts payable and accrued expenses (336) (8,220)
Income taxes payable and income taxes receivable 9,224 11,847
Deferred revenue 3,699 (265)
Other long-term liabilities (3,505) 147
Net cash provided by operating activities 33,217 31,393
Cash flows from investing activities:    
Purchases of property and equipment (996) (2,368)
Net cash used in investing activities (996) (2,368)
Cash flows from financing activities:    
Payments on term loan (781) (781)
Repurchase of common stock    (24,999)
Net cash used in financing activities (781) (25,780)
Net increase in cash and cash equivalents 31,440 3,245
Cash and cash equivalents - beginning of period 94,760 47,517
Cash and cash equivalents - end of period 126,200 50,762
Non-cash transactions:    
Purchases of property and equipment included in accounts payable $ 22 $ 706