Accumulated Other Comprehensive Income (Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 983,182	$ 836,640
Interest expense, net	(30,853)	(25,676)
Selling, general and administrative	(312,108)	(304,847)
Income before income taxes	73,092	96,549
Benefit provision for income tax	19,579	31,416
Net income	53,513	65,133
Reclassification out of Accumulated Other Comprehensive Loss | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	(3)	28
Cost of sales	(84)	(111)
Interest expense, net	(507)	(507)
Income before income taxes	(594)	(590)
Benefit provision for income tax	(151)	(230)
Net income	(443)	(360)
Reclassification out of Accumulated Other Comprehensive Loss | Available for sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	(24)	(109)
Benefit provision for income tax	(6)	(40)
Net income	(18)	(69)
Reclassification out of Accumulated Other Comprehensive Loss | Pension and postretirement benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(10,975)	(10,225)
Benefit provision for income tax	(2,803)	(3,517)
Net income	(8,172)	(6,708)
Reclassification out of Accumulated Other Comprehensive Loss | Transition credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative	2	2
Reclassification out of Accumulated Other Comprehensive Loss | Prior service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative	(55)	(41)
Reclassification out of Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative	$ (10,922)	$ (10,186)