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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 33 $ 6,292
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,711 2,412
Stock-based compensation 1,957 720
Deferred income tax benefit (275) (80)
Loss on disposition and impairment of property and equipment 7 0
Excess tax shortfall from stock-based compensation 2,095 232
Change in assets and liabilities:    
Accounts receivable and other assets (53) (161)
Prepaid program costs and expenses (9,189) (11,526)
Accounts payable, accrued expenses, and other current liabilities 2,406 3,865
Participants' deposits 23,723 26,931
Net cash provided by operating activities 23,415 28,685
Cash flows from investing activities:    
Purchase of available-for-sale securities (26,844) (69,537)
Proceeds from sale of available-for-sale securities 7,329 29,734
Purchase of property and equipment (1,799) (2,704)
Purchase of intangibles (164) (293)
Net cash used in investing activities (21,478) (42,800)
Cash flows from financing activities:    
Repurchase of Common Stock (486) 0
Dividend payment to shareholders (1,017) (2,110)
Proceeds from exercise of stock options 5 0
Excess tax shortfall from stock-based compensation (2,095) (232)
Net cash used in financing activities (3,593) (2,342)
Net decrease in cash and cash equivalents (1,656) (16,457)
Cash and cash equivalents, beginning of period 6,150 19,519
Cash and cash equivalents, end of period $ 4,494 $ 3,062