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Accumulated Other Comprehensive Income (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary of reclassifications out of accumulated other comprehensive income    
Gains and losses on cash flow hedges, Income tax provision $ (19) $ 161
Net of tax 51 (411)
Total reclassifications, net of tax 3,878 2,606
Costs of products sold [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Gains (losses) on cash flow hedges, costs of products sold 70 (572)
Pension Plan Items [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Subtotal 6,063 4,936
Income tax provision (2,284) (1,885)
Net of tax 3,779 3,051
Pension Plan Items [Member] | Costs of products sold [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Amortization of deferred benefit, Prior service costs 613 506
Amortization of deferred benefit, Actuarial losses 4,114 3,490
Pension Plan Items [Member] | Selling, general and administrative expenses [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Amortization of deferred benefit, Prior service costs 161 107
Amortization of deferred benefit, Actuarial losses 1,175 833
Other Plan Items [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Subtotal 77 (55)
Income tax provision (29) 21
Net of tax 48 (34)
Other Plan Items [Member] | Costs of products sold [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Amortization of deferred benefit, Prior service costs (100) (190)
Amortization of deferred benefit, Actuarial losses 155 138
Other Plan Items [Member] | Selling, general and administrative expenses [Member]
    
Summary of reclassifications out of accumulated other comprehensive income    
Amortization of deferred benefit, Prior service costs (25) (44)
Amortization of deferred benefit, Actuarial losses $ 47 $ 41