Basis of Presentation and Significant Accounting Policies (Other Current Assets) (Details) (Successor, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Successor
Other Current Assets [Line Items]
Prepaid expenses	$ 1,210	$ 3,652
California carbon allowance inventories	38,409	15,895
Oil inventories	4,034	7,436
Materials inventories	1,747	3,036
Receivables from exchanges of properties and divestitures, and other	13,859	814
Other current assets	$ 59,259	$ 30,833

Carrying amount as of the balance sheet date of purchased carbon allowances in inventory.

No definition available.

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- Definition

Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

+ References

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

-Publisher FASB

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5

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- Definition

Carrying amount as of the balance sheet date of petroleum or crude oil.

+ References

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- Definition

Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

+ References

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-Subparagraph (SX 210.5-02.8)

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- Definition

Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories not otherwise specified in the taxonomy.

+ References

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-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

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-Paragraph 2

-Subparagraph (SAB TOPIC 5.BB)

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-Subparagraph (SX 210.5-02.6)

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- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

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-Glossary Current Assets

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-Subparagraph (g)

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