Pensions and Other Postretirement Benefit Plans (Schedule of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	$ 171,387	$ 183,199
Actual return on plan assets, net of expenses	19,740	730
Employer contributions	6,605	5,287
Plan participants' contributions	249	304
Benefits paid	(7,057)	(6,530)
Settlements	(2,308)	(688)
Foreign currency changes	(7,944)	(10,915)
Fair value of plan assets, end of year	180,672	171,387
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year
Actual return on plan assets, net of expenses
Employer contributions	4,812	4,758
Plan participants' contributions	72	1,068
Benefits paid	(4,812)	(4,758)
Settlements
Foreign currency changes
Fair value of plan assets, end of year