Income Taxes (Deferred Income Taxes Components) (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Income Tax Liabilities [Line Items]
Accrued postretirement benefits	$ 9,444	$ 13,763
Other benefit obligations	120,792	108,349
Accounts receivable	10,780	12,840
State income tax loss carryforwards	23,178	19,550
U.S. Federal income tax loss carryforwards	6,212	5,007
Non-U.S. income tax loss carryforwards	19,246	26,921
Non-U.S. capital loss carryforwards	1,929	10,055
Other	44,401	44,858
Deferred tax assets	237,903	242,717
Valuation allowance	(41,319)	(69,545)
Deferred tax assets, net	196,584	173,172
Property, plant and equipment	13,591	17,465
Unrealized gain on available-for-sale securities	61,964	39,010
Goodwill and other intangible assets	132,997	133,097
Deferred tax liabilities	558,430	576,488
Deferred Income Tax Liabilities, Net	361,846	403,316
non-U.S. [Member]
Deferred Income Tax Liabilities [Line Items]
U.S Federal foreign income tax credit carryforwards	1,921	1,374
Non-U.S. income tax loss carryforwards	19,200
Non-U.S. capital loss carryforwards	1,900
Valuation allowance	(9,500)
Pension Plan [Member]
Deferred Income Tax Liabilities [Line Items]
Prepaid pension cost	$ 349,878	$ 386,916