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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, £ in Thousands, SFr in Thousands, CAD in Thousands	12 Months Ended
	Dec. 31, 2016 GBP (£)	Dec. 31, 2015 GBP (£)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 CAD	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 CHF (SFr)	Dec. 31, 2015 CAD
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | CAD				CAD 11,001			CAD 1,302
Derivative, Maturity Date	Feb. 01, 2018	Feb. 01, 2016
British Pounds [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | £	£ 1,842	£ 2,047
Derivative, Maturity Date	Feb. 01, 2018	Feb. 01, 2017
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | €			€ 14,366		€ 13,295
Derivative, Maturity Date	Feb. 01, 2018	Feb. 01, 2017
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | SFr						SFr 17,738
Derivative, Maturity Date		Feb. 01, 2017

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- Definition

Foreign Exchange Contracts [Line Items]

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5580258-113959

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

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