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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities:    
Consolidated net income (loss) $ (9,586) $ 585
Adjustments to reconcile consolidated net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 5,028 5,244
Deferred income taxes (4,307) (222)
Severance charges 1,361   
Stock-based compensation expense 1,402 670
Decrease in long-term deferred revenue (71) (72)
Excess tax benefit of stock-based compensation (53) (52)
Gain on disposal of equipment (3) (33)
Credit loss (gain) on available-for-sale securities 79 (4)
Increase (decrease) in long-term income taxes payable 21 (18)
Change in current assets and liabilities, net 1,913 6,790
Net cash (used for) provided by operating activities (4,216) 12,888
Investing activities:    
Additions to property, plant and equipment (2,543) (2,785)
Sales and maturities of investments 334 450
Purchases of investments   (270)
Proceeds from sale of equipment 3 33
Decrease in other assets 57 11
Net cash used in investing activities (2,149) (2,561)
Financing activities:    
Purchases of Common Stock (17,100)  
Excess tax benefit of stock-based compensation 53 52
Proceeds from issuance of Common Stock 55 8
Net cash (used for) provided by financing activities (16,992) 60
Effect of foreign exchange rates on cash (419) (51)
Net (decrease) increase in cash and cash equivalents (23,776) 10,336
Cash and cash equivalents at beginning of period 84,554 71,908
Cash and cash equivalents at end of period $ 60,778 $ 82,244