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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, £ in Thousands, NOK in Thousands, CAD in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 NOK	Dec. 31, 2016 GBP (£)	Sep. 30, 2017 GBP (£)	Sep. 30, 2017 EUR (€)	Sep. 30, 2017 CAD	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 CAD
Norwegian Kroner [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | NOK	NOK 7,449
Norwegian Kroner [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date	Feb. 01, 2018
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | CAD					CAD 13,345		CAD 11,001
Canadian Dollars [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date	Feb. 01, 2019	Feb. 01, 2018
British Pounds [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | £		£ 1,842	£ 2,343
British Pounds [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date	Feb. 01, 2019	Feb. 01, 2018
Euro [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount | €				€ 22,200		€ 14,366
Euro [Member] | Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Line Items]
Derivative, Maturity Date	Feb. 01, 2019	Feb. 01, 2018

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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=64837297&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=64837297&loc=SL5580258-113959

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- Definition

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

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