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Derivative Instruments and Hedging Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Maximum [Member]
Derivative instruments and hedging activity for the period [Abstract]
Number of months for contracts to mature		18 months
Forward Exchange Contracts [Member]
Derivative instruments and hedging activity for the period [Abstract]
Amount of gain (loss) reclassified into net earnings		$ (100)	$ 200
Forward Exchange Contracts [Member] | Cash Flow Hedges [Member]
Derivative instruments and hedging activity for the period [Abstract]
Derivative, fair value	$ 79,900	79,900		$ 44,900
Foreign Currency Denominated Debt, Net Investment Hedging [Member]
Derivative instruments and hedging activity for the period [Abstract]
Carrying value of foreign denominated debt	371,300	371,300		$ 261,900
Impact of foreign exchange rates on debt instruments recorded in Other Comprehensive Income	$ (2,200)	$ (8,900)

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- References

No definition available.

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- Definition

Number of months for contracts to mature in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Fair value of all asset derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
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- Definition

Amount of increase (decrease) in the cumulative translation adjustment from gain (loss), after tax, on foreign currency derivatives, that are designated as, and are effective as, economic hedges of a net investment in a foreign entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 30
-Section 45
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