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Derivative Instruments And Hedging Activities (Narrative) (Details) In Millions, unless otherwise specified | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Feb. 28, 2013 Oil And Natural Gas Commodity Contracts [Member] USD ($) | Feb. 28, 2013 Interest Rate Swaps [Member] USD ($) | Sep. 30, 2013 Interest Rate Swaps [Member] USD ($) | Feb. 28, 2013 Grand Canyon I I I [Member] USD ($) | Feb. 28, 2013 Grand Canyon I I I [Member] NOK | Feb. 28, 2013 Grand Canyon I I [Member] USD ($) | Feb. 28, 2013 Grand Canyon I I [Member] NOK | Jan. 31, 2013 Grand Canyon [Member] USD ($) | Jan. 31, 2013 Grand Canyon [Member] NOK
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative Cash Settlement | $ 22.5 | $ 0.6 |  |  |  |  |  |  |
Notional Amount of Derivative |  |  | $ 148.1 | $ 98.8 | 595.0 | $ 100.4 | 594.7 | $ 104.6 | 591.3

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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