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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, £ in Thousands, kr in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended |  |
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Jun. 30, 2018 GBP (£) | Dec. 31, 2017 NOK (kr) | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 CAD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 CAD ($)
Norwegian Kroner [Member] |  |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |  |
Foreign exchange contracts, Notional Amount | kr |  | kr 2,629 |  |  |  |  |
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 | $ |  |  |  | $ 10,535 |  |  | $ 9,538
Canadian Dollars [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |  |
Derivative, Maturity Date | Aug. 01, 2019 | Feb. 01, 2019 |  |  |  |  |
British Pounds [Member] |  |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |  |
Foreign exchange contracts, Notional Amount | £ | £ 266 |  |  |  | £ 1,737 |  |
British Pounds [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |  |
Derivative, Maturity Date | Sep. 01, 2018 | Feb. 01, 2019 |  |  |  |  |
Euro [Member] |  |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |  |
Foreign exchange contracts, Notional Amount | € |  |  | € 11,693 |  |  | € 15,928 |
Euro [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |  |
Derivative, Maturity Date | Aug. 01, 2019 | Feb. 01, 2019 |  |  |  |  |

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- Definition Foreign Exchange Contracts [Line Items] + References No definition available. + Details
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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=84234895&loc=SL5579245-113959 Reference 2: 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=84234895&loc=SL5580258-113959 + Details
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