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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) € in Thousands, £ in Thousands, $ in Thousands | 12 Months Ended |  |
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Dec. 31, 2017 GBP (£) | Dec. 31, 2016 GBP (£) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 CAD ($)
Norwegian Kroner [Member] |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |
Foreign exchange contracts, Notional Amount |  |  |  | $ 2,629 |  |
Derivative, Maturity Date | Feb. 01, 2018 |  |  |  |  |
Canadian Dollars [Member] |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |
Foreign exchange contracts, Notional Amount |  |  |  | $ 9,538 |  | $ 11,001
Derivative, Maturity Date | Feb. 01, 2019 | Feb. 01, 2018 |  |  |  |
British Pounds [Member] |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |
Foreign exchange contracts, Notional Amount | £ | £ 1,737 | £ 1,842 |  |  |  |
Derivative, Maturity Date | Feb. 01, 2019 | Feb. 01, 2018 |  |  |  |
Euro [Member] |  |  |  |  |  |
Foreign Exchange Contracts [Line Items] |  |  |  |  |  |
Foreign exchange contracts, Notional Amount | € |  |  | € 15,928 |  | € 14,366 |
Derivative, Maturity Date | Feb. 01, 2019 | Feb. 01, 2018 |  |  |  |

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