Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

Name:	us-gaap_DerivativeInstrumentsInHedgesLiabilitiesAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Derivative Instruments And Hedging Activities (Narrative) (Details)		1 Months Ended
	Sep. 30, 2013 USD ($)	Feb. 28, 2013 Oil And Natural Gas Commodity Contracts [Member] USD ($)	Feb. 28, 2013 Interest Rate Swaps [Member] USD ($)	Sep. 30, 2013 Interest Rate Swaps [Member] USD ($)	Sep. 30, 2013 Interest Rate Swaps [Member] Accrued Liabilities [Member] USD ($)	Sep. 30, 2013 Foreign Exchange Contracts [Member] Accrued Liabilities [Member] USD ($)	Sep. 30, 2013 Foreign Exchange Contracts [Member] Other Liabilities [Member] USD ($)	Sep. 30, 2013 Grand Canyon I I I [Member] USD ($)	Sep. 30, 2013 Grand Canyon I I I [Member] NOK	Sep. 30, 2013 Grand Canyon I I [Member] USD ($)	Sep. 30, 2013 Grand Canyon I I [Member] NOK	Sep. 30, 2013 Grand Canyon [Member] USD ($)	Sep. 30, 2013 Grand Canyon [Member] NOK
Derivative [Line Items]
Liability derivatives designated as hedging instruments	$ 15,571,000				$ 732,000	$ 1,660,000	$ 13,179,000
Derivative Cash Settlement		22,500,000	600,000
Notional Amount of Derivative				$ 148,100,000				$ 98,800,000	595,000,000	$ 100,400,000	594,700,000	$ 104,600,000	591,300,000