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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Difference between statutory U.S. federal income tax and the Corporation's effective income tax      
Computed at statutory rate $ 5,309 $ 12,154 $ 8,618
Tax differential on non-U.S. earnings (45) (358) (355)
State income taxes 403 1,296 902
Manufacturers deduction (I.R.C. Section 199) (257) (792) (449)
Meals and entertainment 198 220 191
Tax credits (64) (29) (165)
Chinese joint venture (558) (175) (168)
Reversal of valuation allowance (132) (178) (655)
Subpart F income inclusion 0 0 615
Other - net 364 778 153
Total provision (benefit) for taxes on income $ 5,218 $ 12,916 $ 8,687