Accumulated Other Comprehensive Income (Loss) Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	$ 935,132	$ 873,415	$ 871,374
Tax (benefit) expense	59,125	53,677	58,850
Total reclassifications for the period, net of tax	(87,686)	(81,274)	(86,598)
Reclassification out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	18,466	27,359
Tax (benefit) expense	(7,183)	(10,643)
Total reclassifications for the period, net of tax	11,283	16,716
Reclassification out of AOCI | Actuarial Losses Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	19,695	28,165
Tax (benefit) expense	(7,661)	(10,957)
Total reclassifications for the period, net of tax	12,034	17,208
Reclassification out of AOCI | Prior Service Costs Recognized
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, general and administrative expenses	(1,229)	(806)
Tax (benefit) expense	478	314
Total reclassifications for the period, net of tax	$ (751)	$ (492)