Pension and Other Postretirement Benefits (Details 6) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Total	[1]	$ 1,928	$ (5,357)	$ (15,426)
Pensions [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		(808)
Net loss		(7,984)
Amortization of prior service costs		628
Amortization of actuarial loss		10,925
Divestiture (see Note 3)		1,347
Foreign exchange rate changes		(1,223)
Total		2,885
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		0
Net loss		(1,000)
Amortization of prior service costs		21
Amortization of actuarial loss		27
Divestiture (see Note 3)		0
Foreign exchange rate changes		(5)
Total		$ (957)

[1] Net of tax of $401, $(1,420) and $(4,606) for the years ended December 31, 2020, 2019 and 2018, respectively.