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Hedging Instruments (Narrative) (Details) $ in Thousands, € in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivative [Line Items]
Estimated net amount of gains that are expected to be reclassified out of accumulated other comprehensive income and into earnings within the next 12 months	$ 5,800
General duration of foreign currency exchange contracts	24 months
Notional Amount of Foreign Currency Exchange Contracts			$ 203,800	$ 186,700
Accumulated Other Comprehensive Income (Loss), Net Investment Hedge, Net Of Tax			737
Interest Rate Swap Effective On March 30, 2012 [Member]
Derivative [Line Items]
Credit Facility borrowings hedged			$ 40,000
Fixed portion of interest rate associated with interest rate swap		1.36%	1.36%
Interest Rate Swap Effective On March 28, 2013 [Member]
Derivative [Line Items]
Credit Facility borrowings hedged			$ 40,000
Fixed portion of interest rate associated with interest rate swap		1.64%	1.64%
Series C Senior Note [Member]
Derivative [Line Items]
Senior notes payable		€ 88.9	$ 100,000
Senior notes payable, stated interest rate		1.785%	1.785%

X

- 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

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 30



-Section 50



-Paragraph 1



-Subparagraph (c)



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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.22(a)(1))



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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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Fixed interest rate related to the interest rate derivative.

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- Definition

Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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-Section 03



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Cumulative adjustment resulting from gains and losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, commencing as of the designation date. Adjustment reported in equity as part of accumulated other comprehensive income.

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