Pension and Other Postretirement Benefits (Details 3) - Pensions [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 381,064	$ 430,334
Fair value of plan assets	313,461	351,210
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	334,808	388,334
Fair value of plan assets	282,213	322,615
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	46,256	42,000
Fair value of plan assets	$ 31,248	$ 28,595