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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating activities:      
Consolidated net income (loss) $ (23,504) $ (3,798) $ 9,309
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:      
Depreciation and amortization 10,008 10,423 11,005
Deferred income taxes 4,491 (369) 148
Stock-based compensation expense 2,450 1,244 1,923
Impairment of goodwill   2,012  
(Decrease) increase in long-term deferred revenue (139) (139) 350
Increase in long-term income taxes payable (155) 135  
Excess tax benefit of share-based compensation   (105) (133)
Gain on disposal of equipment (26) (33) (21)
Credit loss (gain) on available for sale securities 78 9 (302)
Change in current assets and liabilities, net 2,107 7,859 4,128
Net cash (used for) provided by operating activities (4,690) 17,238 26,407
Investing activities:      
Purchases of investments   (270) (1,104)
Sales and maturities of investments 1,024 3,630 11,142
Additions to property, plant and equipment (6,179) (7,396) (7,466)
Proceeds from sale of equipment 26 33 10
Decrease (increase) in other assets 49 (81) (55)
Net cash (used for) provided by investing activities (5,080) (4,084) 2,527
Financing activities:      
Purchases of Common Stock (17,100)    
Proceeds from issuance of Common Stock 27 9 452
Common Stock dividends paid     (6,272)
Noncontrolling interest dividends paid (531) (378) (690)
Excess (reversal) tax benefit of share-based compensation (451) 105 133
Net cash used in financing activities (18,055) (264) (6,377)
Effect of foreign exchange rates on cash (390) (244) 72
Net (decrease) increase in cash and cash equivalents (28,215) 12,646 22,629
Cash and cash equivalents at beginning of period 84,554 71,908 49,279
Cash and cash equivalents at end of period 56,339 84,554 71,908
Change in assets and liabilities:      
Accounts receivable (821) 4,052 7,546
Inventories, net 33 5,591 (162)
Other current assets (1,647) 380 (224)
Accounts payable and accrued liabilities 4,580 (1,670) (3,861)
Accrued severance charges 49    
Income taxes payable (321) (84) 324
Deferred revenue 234 (410) 505
Change in current assets and liabilities, net 2,107 7,859 4,128
Supplemental disclosures:      
Cash paid during the year for income taxes, net of refunds $ (61) $ 975 $ 4,178