Nonpension Postretirement Benefits (Pre-tax Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Nonpension Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 4,416	$ 4,426
Prior service cost (credit)	(1,463)	(1,323)
Total cost (credit)	2,953	3,103
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	5,146	5,080
Prior service cost (credit)	(1,463)	(1,323)
Total cost (credit)	3,683	3,757
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(730)	(654)
Prior service cost (credit)	0	0
Total cost (credit)	$ (730)	$ (654)