Pensions and Other Postretirement Benefit Plans (Schedule of Funded Status of Plans and Composition of Accrued Pension Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	$ 21,300	$ 14,200
U.S. Pension Plans with Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(660)
U.S. Pension Plans without Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(6,799)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(7,459)
Non-U.S. Pension Plans with Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	17,546
Non-U.S. Pension Plans without Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(25,543)
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(7,997)
Pension Plans with Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	16,886
Pension Plans without Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(32,342)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	211,755	178,942	$ 205,586
Benefit obligation	227,211	201,450	230,911
Funded status	(15,456)	(22,508)
Noncurrent asset	21,337	14,206
Current liability	(2,155)	(2,124)
Noncurrent liability	(34,638)	(34,590)
Net amount recognized	(15,456)	(22,508)
Net actuarial loss	63,240	68,110
Prior service cost/(credit)	639	1,020
Net amount recognized	63,879	69,130
Other postretirement benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Benefit obligation	54,384	51,127	$ 58,531
Funded status	(54,384)	(51,127)
Noncurrent asset
Current liability	(3,808)	(3,890)
Noncurrent liability	(50,576)	(47,237)
Net amount recognized	(54,384)	(51,127)
Net actuarial loss	28,119	25,660
Prior service cost/(credit)	(17,434)	(21,922)
Net amount recognized	$ 10,685	$ 3,738