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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities:    
Consolidated net income (loss) $ (10,484) $ 865
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 7,555 7,870
Deferred income taxes (5,491) (88)
Stock-based compensation expense 1,893 970
Decrease in long-term deferred revenue (104) (107)
Excess tax benefit of stock-based compensation (53) (78)
Gain on disposal of equipment (3) (31)
Credit loss (gain) on available-for-sale securities 78 (16)
Increase (decrease) in long-term income taxes payable 33 (10)
Change in current assets and liabilities, net 3,896 4,932
Net cash (used for) provided by operating activities (2,680) 14,307
Investing activities:    
Additions to property, plant and equipment (4,027) (4,838)
Sales and maturities of investments 603 3,540
Purchases of investments    (270)
Proceeds from sale of equipment 3 31
Decrease in other assets 49 4
Net cash used in investing activities (3,372) (1,533)
Financing activities:    
Purchases of Common Stock (17,100)   
Proceeds from issuance of Common Stock 58 9
Excess tax benefit of stock-based compensation 53 78
Net cash (used for) provided by financing activities (16,989) 87
Effect of foreign exchange rates on cash (325) (17)
Net (decrease) increase in cash and cash equivalents (23,366) 12,844
Cash and cash equivalents at beginning of period 84,554 71,908
Cash and cash equivalents at end of period $ 61,188 $ 84,752