Income Taxes (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) countries	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Income Tax Disclosure [Line Items]
Number of countries in which operations constitute a taxable presence | countries	18
Net increase (decrease) in valuation allowance	$ (5,300)
Tax rates	35.00%	35.00%	35.00%
Federal tax rate of deferred tax assets and liabilities	21.00%
Remeasurement of Company's deferred tax balance tax charge	$ 1,000
Net operating loss carryforwards	111,000
Net operating loss carryforwards, deferred tax asset	23,400	$ 27,800
Net operating loss carryforwards, valuation allowance	12,700
Provisional transition tax	5,800
Current year and prior year earnings of Company's foreign operations	41,000
Foreign withholding taxes	900
Unrepatriated foreign earnings	5,800
Income tax expense recorded due to expected repatriation of foreign earnings	5,800
Accumulated undistributed earnings intended to remain permanently invested	200,000
Recognized interest and penalties related to unrecognized tax benefits	100	100	$ 100
Accrued interest and penalties related to unrecognized tax benefits	400	300	400
Taxes paid, net of refunds	$ 23,700	23,400	$ 18,300
China [Member]
Income Tax Disclosure [Line Items]
Tax rates	25.00%
Mexico [Member]
Income Tax Disclosure [Line Items]
Tax rates	30.00%
Brazil [Member]
Income Tax Disclosure [Line Items]
Tax rates	34.00%
France [Member]
Income Tax Disclosure [Line Items]
Tax rates	33.33%
Valuation Allowance Deferred Tax Assets [Member]
Income Tax Disclosure [Line Items]
Net increase (decrease) in valuation allowance	$ (3,600)
Credit refunded years	2018 to 2022
Valuation Allowance due to Foreign Currency Translation [Member]
Income Tax Disclosure [Line Items]
Net increase (decrease) in valuation allowance	$ 2,100
Tax Attributes With Limited Lives [Member]
Income Tax Disclosure [Line Items]
Net deferred tax asset	$ 43,300
Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Open tax years	2007
Earliest Tax Year [Member] | Research and Development [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards, expiration date	Jan. 01, 2025
Latest Tax Year [Member]
Income Tax Disclosure [Line Items]
Open tax years	2017
State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 20,100
Non-U.S. [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	33,700
Net deferred tax asset	13,978	12,308
Non-U.S. [Member] | Research and Development [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	1,500
Non-U.S. [Member] | Research and Development [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	$ 1,300
Non-U.S. [Member] | Earliest Tax Year [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards, expiration date	Jan. 01, 2020
United States [Member]
Income Tax Disclosure [Line Items]
Net deferred tax asset	$ 45,100
Domestic Tax Authority [Member]
Income Tax Disclosure [Line Items]
Net deferred tax asset	45,097	$ 45,369
Domestic Tax Authority [Member] | Research and Development [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	7,600
AMT credit carryforward [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	$ 1,000