Pensions and Other Postretirement Benefit Plans (Schedule of Funded Status of Plans and Composition of Accrued Pension Cost) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	$ 14,200	$ 16,200
U.S. Pension Plans with Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(2,594)
U.S. Pension Plans without Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(6,716)
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(9,310)
Non-U.S. Pension Plans with Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	11,735
Non-U.S. Pension Plans without Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(24,933)
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(13,198)
Pension Plans with Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	9,141
Pension Plans without Pension Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Net amount recognized	(31,649)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	178,942	205,586	$ 180,672
Benefit obligation	201,450	230,911	210,856
Funded status	(22,508)	(25,325)
Noncurrent asset	14,206	16,242
Current liability	(2,124)	(2,094)
Noncurrent liability	(34,590)	(39,473)
Net amount recognized	(22,508)	(25,325)
Net actuarial loss	68,110	67,283
Prior service cost/(credit)	1,020	572
Net amount recognized	69,130	67,855
Other postretirement benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Benefit obligation	51,127	58,531	$ 57,488
Funded status	(51,127)	(58,531)
Noncurrent asset
Current liability	(3,890)	(4,108)
Noncurrent liability	(47,237)	(54,423)
Net amount recognized	(51,127)	(58,531)
Net actuarial loss	25,660	34,717
Prior service cost/(credit)	(21,922)	(26,411)
Net amount recognized	$ 3,738	$ 8,306