Fair Value Measurements and Derivative Instruments (Foreign Exchange Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)	$ (211)	$ 154
Foreign exchange contracts
Derivative [Line Items]
Derivative Gain (Loss) Recognized in AOCI (Effective Portion)	(650)	496
Interest rate swap
Derivative [Line Items]
Derivative Gain (Loss) Recognized in AOCI (Effective Portion)	1,776	1,588
Revenue
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)	(179)	(68)
Cost of sales
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)	(32)	222
Interest Expense
Derivative [Line Items]
Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)	0	0
Selling, general and administrative expense \| Foreign exchange contracts
Derivative [Line Items]
Derivative Gain (Loss) Recognized in Earnings	$ (2,203)	$ (2,382)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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