Pension and Other Postretirement Benefits - Information About Accumulated and Projected Benefit Obligations In Excess of Plan Assets (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	$ 124,291	$ 130,549
Accumulated Benefit Obligation	119,493	125,525
Fair Value of Plan Assets	94,826	98,622
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	124,291	130,549
Fair Value of Plan Assets	94,826	98,622
Domestic [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	12,975	12,197
Accumulated Benefit Obligation	11,808	11,456
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	12,975	12,197
Fair Value of Plan Assets	0	0
Foreign [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	111,316	118,352
Accumulated Benefit Obligation	107,685	114,069
Fair Value of Plan Assets	94,826	98,622
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	111,316	118,352
Fair Value of Plan Assets	$ 94,826	$ 98,622