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Income Taxes (Details 6) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:        
Inventory $ 6,509 $ 5,538    
Allowance for doubtful accounts 2,255 2,270    
Unused investment tax credits 6,017 22,835    
Unused loss carryforward-regular tax 28,098 26,388    
Unused loss carryforward-undistributed earnings tax 10,229 8,654    
Other 1,845 1,992    
Total gross deferred tax assets 54,953 67,677    
Less: valuation allowance (38,347) (44,995) (44,825) (53,437)
Net deferred tax assets 16,606 22,682    
Deferred tax liabilities:        
Excess tax benefit for share-based compensation (2,032) 0    
Prepaid pension cost (396) (401)    
Acquired intangible assets (2,180) (3,015)    
Other (119) (78)    
Total gross deferred tax liabilities (4,727) (3,494)    
Net deferred tax assets $ 11,879 $ 19,188