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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities:    
Consolidated net income $ 865 $ 8,548
Adjustments to reconcile consolidated net income to net cash provided by operating activities:    
Depreciation and amortization 7,870 8,214
Stock-based compensation expense 970 1,444
(Decrease) increase in long-term deferred revenue (107) 386
Deferred income taxes (88) 124
Excess tax benefit of stock-based compensation (78) (44)
Gain on disposal of equipment (31) (31)
Credit gain on available for sale securities (16) (295)
Decrease in long-term income taxes payable (10) 0
Change in current assets and liabilities, net 4,932 3,308
Net cash provided by operating activities 14,307 21,654
Investing activities:    
Additions to property, plant and equipment (4,838) (6,251)
Sales and maturities of investments 3,540 8,576
Purchases of investments (270) (603)
Proceeds from sale of equipment 31 10
Decrease (increase) in other assets 4 (43)
Net cash (used in) provided by investing activities (1,533) 1,689
Financing activities:    
Excess tax benefit of stock-based compensation 78 44
Proceeds from issuance of Common Stock 9 446
Common Stock dividends paid 0 (6,272)
Net cash provided by (used for) financing activities 87 (5,782)
Effect of foreign exchange rates on cash (17) 49
Net increase in cash and cash equivalents 12,844 17,610
Cash and cash equivalents at beginning of period 71,908 49,279
Cash and cash equivalents at end of period $ 84,752 $ 66,889