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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities:    
Consolidated net income (loss) $ (4,986) $ 341
Adjustments to reconcile consolidated net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 2,494 2,632
Deferred income taxes (2,264) 15
Severance charges 1,361  
Stock-based compensation expense 263 318
Decrease in long-term deferred revenue (35) (36)
Excess tax benefit of stock-based compensation (43) (51)
Gain on disposal of equipment (3) (24)
Credit gain on available-for-sale securities (1) (3)
Increase (decrease) in long-term income taxes payable 10 (27)
Change in current assets and liabilities, net 1,523 4,359
Net cash (used for) provided by operating activities (1,681) 7,524
Investing activities:    
Additions to property, plant and equipment (1,171) (1,261)
Sales and maturities of investments 234 270
Purchases of investments   (180)
Proceeds from sale of equipment 3 24
Decrease in other assets 47 25
Net cash used in investing activities (887) (1,122)
Financing activities:    
Purchase of Common Stock (10,392)  
Excess tax benefit of stock-based compensation 43 51
Proceeds from issuance of Common Stock 46 8
Net cash (used for) provided by financing activities (10,303) 59
Effect of foreign exchange rates on cash (280) (119)
Net (decrease) increase in cash and cash equivalents (13,151) 6,342
Cash and cash equivalents at beginning of period 84,554 71,908
Cash and cash equivalents at end of period $ 71,403 $ 78,250