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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred income tax liabilities:        
Tax in excess of book depreciation $ 6,670 $ 5,099 $ 5,208  
Goodwill 1,987 1,821 2,209  
Allowance for bad debts   18 62  
Other deferred tax liabilities 112 843 387  
Gross deferred income tax liabilities 8,769 7,781 7,866  
Deferred income tax assets:        
Goodwill 4,141 4,846 5,754  
Inventories 768 167 84  
Pension/Personnel accruals 921 503 1,084  
Deductions for uncollectible Eltmann receivables   310    
Net operating loss carry forwards 3,682 7,526 10,150  
Foreign tax credits 3,844 3,326 3,326  
Guarantee claim deduction 1,141      
Accruals and reserves 293      
Other deferred tax assets 550 421 356  
Gross deferred income tax assets 15,340 17,099 20,754  
Valuation allowance on deferred tax assets (2,252) (12,066) (16,604) (14,649)
Net deferred income tax assets 13,088 5,033 4,150  
Net deferred income tax assets (liabilities) $ 4,319 $ (2,748) $ (3,716)