Pension and Other Postretirement Benefits (Details 5) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	$ 8,044	$ 8,618
Accrued retirement benefits	93,358	104,302
Pensions [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	12,454	7,705
Accrued liabilities	2,977	3,204
Accrued retirement benefits	64,626	75,920
Accumulated other non-owner changes to equity, net	(140,968)	(135,974)
Net actuarial loss	(139,098)	(133,238)
Prior service costs	(1,870)	(2,736)
Pensions [Member] | U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	2,212	0
Accrued liabilities	2,977	2,826
Accrued retirement benefits	49,618	62,893
Accumulated other non-owner changes to equity, net	(122,109)	(121,927)
Net actuarial loss	(119,908)	(119,601)
Prior service costs	(2,201)	(2,326)
Pensions [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	10,242	7,705
Accrued liabilities	0	378
Accrued retirement benefits	15,008	13,027
Accumulated other non-owner changes to equity, net	(18,859)	(14,047)
Net actuarial loss	(19,190)	(13,637)
Prior service costs	331	(410)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	5,067	5,414
Accrued retirement benefits	28,172	27,662
Accumulated other non-owner changes to equity, net	(3,079)	(2,716)
Net actuarial loss	(2,981)	(2,618)
Prior service costs	$ (98)	$ (98)