Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
U.S.	$ 13,934	$ (28,281)	$ 9,235
Interest and penalties recognized	300	200
Asset
Depreciation and amortization (a)	0	0
Expense accruals	18,421	18,827
Inventories	4,568	3,071
Provision for receivables	1,109	689
Operating loss carryforwards	85,378	81,755
Foreign tax credit carryforwards	24,219	25,814
Capital loss carryforwards	0	9,759
Pensions	38,766	40,442
Currency adjustments	462	3,796
Post-retirement benefits	411	471
Stock based compensation	6,572	5,832
Other	0	5,477
Deferred Tax Liabilities, Other	769
Subtotal	179,906	195,933
Valuation allowance	(127,074)	(137,450)
Total deferred income taxes	52,832	58,483
Liability
Depreciation and amortization (a)	58,229	8,714
Deferred revenue	3,222	3,122
Deferred financing costs	566	2,226
Total deferred income taxes	62,786	14,062
Deferred Tax Assets, Net, Classification [Abstract]
Deferred income tax assets	14,288	48,551
Other liabilities	24,242	$ 4,130
Sale of Businesses Reduction of Tax Paid, Change in Capital Loss Carryforwards, Foreign Tax Credit Carryforwards, State Net Operating Loss Carryforwards, Foreign Tax Credit Carryforwards	12,500
Merger and Liquidation of Foreign Dormant Entities, Valuation Allowance Reduction, Reduction to Deferred Tax Assets	5,600
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	7,900
Domestic Tax Authority [Member]
Asset
Operating loss carryforwards	6,000
International operations
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards not subject to expiration	57,000
Asset
Operating loss carryforwards	66,500
Deferred Tax Assets, Net, Classification [Abstract]
Operating losses subject to expiration	9,500
U.S. state
Asset
Operating loss carryforwards	12,900
U.S. state | Tax Years 2020 Through 2024 [Member]
Asset
Operating loss carryforwards	3,300
U.S. state | Tax Years 2025 Through 2029 [Member]
Asset
Operating loss carryforwards	1,900
U.S. state | Tax Years 2030 Through 2034
Asset
Operating loss carryforwards	3,200
U.S. state | Tax Years 2035 Through 2039 [Member]
Asset
Operating loss carryforwards	$ 4,500