Accumulated Other Comprehensive Loss (Changes in Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 1,844,277	$ 1,920,158	$ 1,839,654
Other comprehensive (loss) income before reclassifications	(77,251)	23,433	54,363
Income tax	14,640	8,060	(24,644)
Net other comprehensive (loss) income before reclassifications	(62,611)	31,493	29,719
Reclassifications	53,976	53,745	31,934
Net reclassifications	41,324	33,839	20,105
Reclassification of certain tax effects	0
Total other comprehensive (loss) income, net of tax	(21,287)	65,332	49,824
Balance, end of period	1,773,949	1,844,277	1,920,158
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(500,049)	(565,381)	(615,205)
Income tax	(12,652)	(19,906)	(11,829)
Reclassification of certain tax effects	(108,348)
Total other comprehensive (loss) income, net of tax	(21,287)	65,332	49,824
Balance, end of period	(629,684)	(500,049)	(565,381)
Foreign currency translation adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(21,852)	(68,132)	(58,844)
Other comprehensive (loss) income before reclassifications	(28,212)	52,145	(7,591)
Income tax	3,202	(5,865)	(1,697)
Net other comprehensive (loss) income before reclassifications	(25,010)	46,280	(9,288)
Reclassifications	0	0	0
Income tax	0	0	0
Net reclassifications	0	0	0
Reclassification of certain tax effects	(2,746)
Total other comprehensive (loss) income, net of tax	(25,010)	46,280	(9,288)
Balance, end of period	(49,608)	(21,852)	(68,132)
Marketable securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	0	(1,194)	(1,094)
Other comprehensive (loss) income before reclassifications	0	1,896	(159)
Income tax	0	(702)	59
Net other comprehensive (loss) income before reclassifications	0	1,194	(100)
Reclassifications	0	0	0
Income tax	0	0	0
Net reclassifications	0	0	0
Reclassification of certain tax effects	0
Total other comprehensive (loss) income, net of tax	0	1,194	(100)
Balance, end of period	0	0	(1,194)
Derivative financial instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(17,254)	12,524	5,886
Other comprehensive (loss) income before reclassifications	35,686	(54,929)	28,176
Income tax	(8,455)	20,338	(10,436)
Net other comprehensive (loss) income before reclassifications	27,231	(34,591)	17,740
Reclassifications	(9,466)	7,644	(17,633)
Income tax	2,244	(2,831)	6,531
Net reclassifications	(7,222)	4,813	(11,102)
Reclassification of certain tax effects	(970)
Total other comprehensive (loss) income, net of tax	20,009	(29,778)	6,638
Balance, end of period	1,785	(17,254)	12,524
Derivative financial instruments \| Foreign currency contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	(11,492)	7,202	(18,253)
Derivative financial instruments \| Commodity contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	(24)		258
Derivative financial instruments \| Treasury rate locks
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	498	442	362
Derivative financial instruments \| Interest Rate Swap [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	1,552
Pension and postretirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(460,943)	(508,579)	(561,153)
Other comprehensive (loss) income before reclassifications	(84,725)	24,321	33,937
Income tax	19,893	(5,711)	(12,570)
Net other comprehensive (loss) income before reclassifications	(64,832)	18,610	21,367
Reclassifications	63,442	46,101	49,567
Income tax	(14,896)	(17,075)	(18,360)
Net reclassifications	48,546	29,026	31,207
Reclassification of certain tax effects	(104,632)
Total other comprehensive (loss) income, net of tax	(16,286)	47,636	52,574
Balance, end of period	(581,861)	(460,943)	(508,579)
Pension and postretirement benefit plans; Prior service credits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	(2,262)	(1,153)	(1,784)
Pension and postretirement benefit plans; Actuarial losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	66,590	$ 47,254	49,888
Pension and postretirement benefit plans; Curtailment and settlement losses
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassifications	$ (886)		$ 1,463

Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect

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