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Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended | 12 Months Ended |
|---|---|---|
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Jun. 30, 2012
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Dec. 31, 2011
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Norwegian Kroners [Member]
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| Foreign Exchange Contracts [Line Items] | ||
| Foreign exchange contracts, Notional Amount | $ 322 | $ 3,633 |
| Derivative, Maturity Date | Sep. 01, 2012 | Sep. 01, 2012 |
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British Pounds [Member]
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| Foreign Exchange Contracts [Line Items] | ||
| Foreign exchange contracts, Notional Amount | 940 | 1,632 |
| Derivative, Maturity Date | Feb. 01, 2013 | Feb. 01, 2013 |
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Euros [Member]
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| Foreign Exchange Contracts [Line Items] | ||
| Foreign exchange contracts, Notional Amount | 12,878 | 14,937 |
| Derivative, Maturity Date | Aug. 01, 2013 | Feb. 01, 2013 |
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Swiss Francs [Member]
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| Foreign Exchange Contracts [Line Items] | ||
| Foreign exchange contracts, Notional Amount | 16,892 | 24,225 |
| Derivative, Maturity Date | Aug. 01, 2013 | Feb. 01, 2013 |
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Canadian Dollars [Member]
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| Foreign Exchange Contracts [Line Items] | ||
| Foreign exchange contracts, Notional Amount | $ 6,828 | $ 9,141 |
| Derivative, Maturity Date | Mar. 01, 2013 | Mar. 01, 2013 |