Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 725,000
Cash held by non-US subsidiaries	464,000	$ 358,000
Income tax benefits attributable to equity-based compensation	(400)	(1,600)	$ (7,700)
Tax expense/(benefit) related to changes in pension and post-retirement plan assets and benefit obligations	(8,400)	4,600	(61,100)
Unrealized tax asset on related tax loss	96,500	98,700
Valuation allowance against U.S. and non-U.S. deferred tax assets	51,700	47,200
Total valuation allowance	148,200	145,900
Increase in total amount of unrecognized tax benefits that would impact effective tax rate	47,600	46,600	42,200
Interest expense and penalties, related to unrecognized tax benefits	400	1,100	$ 700
Unrecognized tax benefits, income tax penalties and interest accrued	6,200	$ 5,800
Change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	$ 7,800