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Financial Instruments and Fair Value Measurements (Narrative) (Details) € in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($)		Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)		Sep. 30, 2017 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other Liabilities, Fair Value Disclosure	$ 20,002			$ 20,002				$ 20,746
Transfers in or out of Level 3				0
Euro-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Gain (loss) on derivative instruments held for trading purposes, net	10		$ (36)	52		$ (164)
Cash Flow Hedging [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
(Gain) loss from cash flow hedge derivatives to be reclassified	(665)			(665)
Cash Flow Hedging [Member] | U.S. Dollar Denominated Foreign Currency Forward Contracts, Swedish Krona Functional Currency [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	2,000			2,000				0
Cash Flow Hedging [Member] | U.S. Dollar Denominated Foreign Currency Forward Contracts Euro Functional Currency [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	500			500				0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Forward Currency Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	7,112	[1]		7,112	[1]			9,143
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Mexican Peso-Denominated Foreign Currency Forward Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	4,612			4,612				9,143
Not Designated as Hedging Instrument [Member] | Forward Currency Contracts [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Notional amounts	$ 920	[1]		$ 920	[1]			$ 1,486
Orlaco [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Other Liabilities, Fair Value Disclosure | €							€ 7,500
[1] Notional amounts represent the gross contract of the derivatives outstanding in U.S. dollars.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4F
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624186-113959

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