Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	$ 244,732	$ 232,067
Tax (benefit) expense	10,142	7,985
Total reclassifications for the period, net of tax	(15,097)	(12,494)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	4,700	4,743
Tax (benefit) expense	(1,828)	(1,845)
Total reclassifications for the period, net of tax	2,872	2,898
Actuarial Losses Recognized | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	5,150	5,175
Tax (benefit) expense	(2,003)	(2,013)
Total reclassifications for the period, net of tax	3,147	3,162
Prior Service Costs Recognized | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	(450)	(432)
Tax (benefit) expense	175	168
Total reclassifications for the period, net of tax	$ (275)	$ (264)