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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension items reclassified out of other comprehensive income [Abstract]        
Selling and administrative expense $ 81,455 $ 73,843 $ 204,384 $ 154,642
Reclassification out of Accumulated Other Comprehensive Income [Member]
       
Pension items reclassified out of other comprehensive income [Abstract]        
Total before income taxes (114) 842 (231) 1,685
Tax expense (benefit) 54 (315) 109 (630)
Net earnings (60) 527 (122) 1,055
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 86 86
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 $ (157) $ 799 $ (317) $ 1,599