Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	$ 254,969	$ 244,672	$ 750,266	$ 717,648
Tax (benefit) expense	20,724	19,431	48,396	44,414
Total reclassifications for the period, net of tax	(30,196)	(28,397)	(70,987)	(66,036)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	4,529	4,836	13,587	14,508
Tax (benefit) expense	(1,762)	(1,881)	(5,286)	(5,644)
Total reclassifications for the period, net of tax	2,767	2,955	8,301	8,864
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	4,968	5,268	14,904	15,804
Tax (benefit) expense	(1,933)	(2,049)	(5,798)	(6,148)
Total reclassifications for the period, net of tax	3,035	3,219	9,106	9,656
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	(439)	(432)	(1,317)	(1,296)
Tax (benefit) expense	171	168	512	504
Total reclassifications for the period, net of tax	$ (268)	$ (264)	$ (805)	$ (792)