Pensions and Other Postretirement Benefit Plans (Schedule of Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning of year	$ 205,586	$ 180,672
Actual return on plan assets, net of expenses	(8,449)	19,182
Employer contributions	10,071	4,645
Plan participants' contributions	228	211
Benefits paid	(7,814)	(7,697)
Settlements	(13,029)	(8)
Foreign currency changes	(7,652)	8,581
Fair value of plan assets, end of year	178,942	205,586
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	3,474	4,230
Plan participants' contributions	14	37
Benefits paid	(3,473)	(4,230)
Settlements
Foreign currency changes
Fair value of plan assets, end of year