Fortune Creek (Details) In Millions, unless otherwise specified	3 Months Ended	15 Months Ended
Mar. 31, 2013 acre	Mar. 31, 2013 KKR [Member] USD ($) in mi Y	Mar. 31, 2013 KKR [Member] CAD Y	Mar. 31, 2013 KKR [Member] USD ($) Y
Area of business, acres	30,000,000
Length of gathering line contributed to partnership, miles		20	20
Diameter of gathering line contributed to partnership, inches		20	20
Minimum capital expenditures		$ 300.0		$ 148.3
Expenditures Required to Acquire Productive Assets Within the Next Twelve Months		31.7
Dedicated years for gas production		10	10	10
Payments to acquire interest in joint venture		125
Percentage of interest by parent in the partnership		50.00%	50.00%	50.00%
Maximum construction project contributions			130

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Diameter of gathering line contributed to partnership, inches

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Expenditures Required to Acquire Productive Assets Within the Next Nine Months

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Significant oil and gas supplies dedicated or contracted to the enterprise that can be used to fulfill existing contracts or agreements.

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

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-Name Industry Guide

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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