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Derivative and hedging instruments (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of derivative assets and liabilities by balance sheet location

The following table provides the fair value and balance sheet classification of our derivative:

Fair Value of Derivative Assets and Liabilities
	Balance sheet location	March 31, 2015		December 31, 2014
E.ON contingent obligation – net (1)	Other liabilities	—		—

(1) See Note 10 Debt for additional information about the E.ON contingent obligation.

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments:
	Gain (loss) recognized in income from derivatives
		Three months ended March 31,
	Location	2015			2014
E.ON contingent obligation – net	Net gain (loss) on forward and derivative contracts	$	353		$	353
Midwest premium contracts	Net gain (loss) on forward and derivative contracts	—			(1,080		)
E.ON contingent obligation – net	Interest expense	(353		)	(353		)

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- Definition

Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

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- Definition

Tabular disclosure for other derivative instruments not designated as hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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