Pension and Other Postretirement Benefits (Details 6) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total	[1]	$ 5,357	$ 15,426	$ (10,726)
Pensions [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		560
Net loss		(12,607)
Amortization of prior service costs (credits)		308
Amortization of actuarial loss		7,050
Foreign exchange rate changes		(305)
Total		(4,994)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		0
Net loss		(289)
Amortization of prior service costs (credits)		19
Amortization of actuarial loss		9
Foreign exchange rate changes		(102)
Total		$ (363)

[1] Net of tax of $(1,420), $(4,606) and $4,469 for the years ended December 31, 2019, 2018 and 2017, respectively.