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Pension and Other Postretirement Benefit Plans (Amounts recognized in balance sheet) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]                
Net long-term pension asset $ 6,939 $ 6,945 $ 6,685 $ 6,815 $ 6,359 $ 6,125 $ 6,387 $ 5,642
Foreign Plan [Member]
               
Defined Benefit Plan Disclosure [Line Items]                
Net long-term pension asset 6,939       6,359      
Accumulated other comprehensive loss consists of the following:                
Net prior service cost 216       262      
Net loss 4,770       4,851      
Accumulated other comprehensive loss before taxes $ 4,986       $ 5,113