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Accumulated Other Comprehensive Income, Reclassification out of Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Pension items reclassified out of other comprehensive income [Abstract]        
Selling and administrative expense $ 85,407 $ 70,685 $ 280,981 $ 224,231
Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Pension items reclassified out of other comprehensive income [Abstract]        
Total before income taxes 29 841 (202) 2,526
Income tax expense (benefit) (2) (315) 107 (945)
Total net of tax 27 526 (95) 1,581
Prior Service Cost [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Pension items reclassified out of other comprehensive income [Abstract]        
Selling and administrative expense 43 43 129 129
Actuarial (Gain) Loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Pension items reclassified out of other comprehensive income [Abstract]        
Selling and administrative expense $ (14) $ 798 $ (331) $ 2,397