Pension (Net Pension Expense) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	$ 5,151	$ 5,001
Interest cost on projected benefit obligation	15,599	16,536
Expected return on plan assets	(22,658)	(22,479)
Amortization of unrecognized:
Prior service cost (credit)	(200)	32
Actuarial loss	7,094	5,826
Settlement charge	92	245
Pension expense	5,078	5,161
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	4,009	3,916
Interest cost on projected benefit obligation	12,615	13,787
Expected return on plan assets	(22,658)	(22,479)
Amortization of unrecognized:
Prior service cost (credit)	1	236
Actuarial loss	6,472	5,232
Settlement charge	0	245
Pension expense	439	937
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	1,142	1,085
Interest cost on projected benefit obligation	2,984	2,749
Expected return on plan assets	0	0
Amortization of unrecognized:
Prior service cost (credit)	(201)	(204)
Actuarial loss	622	594
Settlement charge	92	0
Pension expense	$ 4,639	$ 4,224