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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (8,059) $ (7,906)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 1,326 1,181
Stock-based compensation 1,751 350
Deferred income tax benefit (3,724) (89)
Loss on disposition and impairment of property and equipment 4 0
Excess tax benefit from stock-based compensation 351 137
Change in assets and liabilities:    
Accounts receivable and other assets (500) (2,717)
Prepaid program costs and expenses (9,197) (9,754)
Accounts payable, accrued expenses, and other current liabilities 736 (647)
Participants' deposits 37,443 46,379
Net cash provided by operating activities 20,131 26,934
Cash flows from investing activities:    
Purchase of available-for-sale securities (15,633) (37,764)
Proceeds from sale of available-for-sale securities 189 3,393
Purchase of property and equipment (606) (719)
Purchase of intangibles (82) (132)
Net cash used in investing activities (16,132) (35,222)
Cash flows from financing activities:    
Repurchase of Common Stock (487) 0
Dividend payment to shareholders (1,017) (1,054)
Proceeds from exercise of stock options 5 0
Excess tax benefit from stock-based compensation (351) (137)
Net cash used in financing activities (1,850) (1,191)
Net increase (decrease) in cash and cash equivalents 2,149 (9,479)
Cash and cash equivalents, beginning of period 6,150 19,519
Cash and cash equivalents, end of period $ 8,299 $ 10,040