Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Tax loss carryforwards	$ 24,300
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Total deferred tax assets	46,052	$ 60,095
Total deferred tax liabilities	16,712	23,992
Net deferred tax asset	29,340	36,103
Non-U.S. [Member]
Income Tax Disclosure [Line Items]
Total deferred tax assets	22,908	24,713
Total deferred tax liabilities	11,629	5,740
Net deferred tax asset	11,279	18,973
Noncurrent Assets [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Accounts receivable	823	686
Inventories	636	442
Deferred compensation	4,730	4,460
Depreciation and amortization
Postretirement benefits	14,885	14,759
Tax loss carryforwards	2,266	1,199
Tax credit carryforwards	15,931	30,523
Derivatives	1,411
Reserves	2,953	3,954
Deferred Revenue	2,417	3,556
Other		516
Deferred tax assets before valuation allowance	46,052	60,095
Total deferred tax assets	46,052	60,095
Noncurrent Assets [Member] | Non-U.S. [Member]
Income Tax Disclosure [Line Items]
Accounts receivable	1,050	1,224
Inventories	1,231	829
Deferred compensation	1,386	1,053
Depreciation and amortization	4,892	4,252
Postretirement benefits	1,048	1,667
Tax loss carryforwards	21,467	21,890
Tax credit carryforwards	936	1,197
Derivatives
Reserves
Deferred Revenue
Other
Deferred tax assets before valuation allowance	32,010	33,102
Less: valuation allowance	(9,102)	(8,389)
Total deferred tax assets	22,908	24,713
Noncurrent Liabilities [Member] | Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Unrepatriated foreign earnings	2,202	4,028
Depreciation and amortization	4,404	12,848
Postretirement benefits
Deferred Gain	3,391	3,762
Derivatives		1,162
Flow-through DTL's	6,205	2,192
Deferred Revenue
Other	510
Total deferred tax liabilities	16,712	23,992
Noncurrent Liabilities [Member] | Non-U.S. [Member]
Income Tax Disclosure [Line Items]
Unrepatriated foreign earnings
Depreciation and amortization
Postretirement benefits
Deferred Gain
Derivatives
Flow-through DTL's
Deferred Revenue	8,492	5,740
Other	3,137
Total deferred tax liabilities	$ 11,629	$ 5,740