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Income Taxes (Details 6) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred tax assets:        
Inventory $ 5,538 $ 4,219    
Allowance for doubtful accounts 2,270 2,303    
Unused investment tax credits 22,835 39,393    
Unused loss carry-forward 26,388 20,919    
Other 1,992 987    
Total gross deferred tax assets 59,023 67,821    
Less: valuation allowance (36,341) (35,241) (42,906) (28,428)
Net deferred tax assets 22,682 32,580    
Deferred tax liabilities:        
Unrealized foreign exchange gain 0 (2,112)    
Prepaid pension cost (401) (361)    
Acquired intangible assets (3,015) (1,041)    
Other (78) (36)    
Total gross deferred tax liabilities (3,494) (3,550)    
Net deferred tax assets $ 19,188 $ 29,030