Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) - 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]
Other (expense) income, net		$ 18,225	$ 40,458	$ (15,871)	$ 29,885
Interest expense		8,614	7,830	24,533	24,679
Provision (Benefit) for Income Taxes		7,800	(30,500)	54,000	(10,000)
Income Net of Tax		(33,126)	230,935	(132,540)	192,499
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Net of Tax		235	2,692	(3,046)	3,084
Foreign Currency Translation Adjustment [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax		0	6,026	0	5,501
Provision (Benefit) for Income Tax		0	0	0	0
Reclassifications, net of tax		0	6,026	0	5,501
Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net		0	6,026	0	5,501
Unrealized Gain on Available-for-Sale Securities [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax				(6,256)	0
Provision (Benefit) for Income Tax				2,502	0
Reclassifications, net of tax				(3,754)	0
Unrealized Gain on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other (expense) income, net		0	0	(6,256)	0
Provision (Benefit) for Income Taxes		0	0	2,502	0
Income Net of Tax		0	0	(3,754)	0
Pension and Other Postretirement Plans [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax		394	(5,557)	1,182	(4,161)
Provision (Benefit) for Income Tax		(157)	2,223	(472)	1,665
Reclassifications, net of tax		237	(3,334)	710	(2,496)
Net Prior Service Cost [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	105	68	314	207
Provision (Benefit) for Income Tax		(41)	(27)	(125)	(82)
Reclassifications, net of tax		64	41	189	125
Net Actuarial Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	289	(5,676)	868	(4,419)
Provision (Benefit) for Income Tax		(116)	2,271	(347)	1,768
Reclassifications, net of tax		173	(3,405)	521	(2,651)
Curtailment Gains Included In Net Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, before tax	[1]	0	51	0	51
Provision (Benefit) for Income Tax		0	(21)	0	(21)
Reclassifications, net of tax		0	30	0	30
Cash Flow Hedge [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications, net of tax				(2)
Cash Flow Hedge [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		(3)	0	(3)	132
Provision (Benefit) for Income Taxes		1	0	1	(53)
Income Net of Tax		$ (2)	$ 0	$ (2)	$ 79

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 10).