v2.4.0.8

Fair Value of Financial and Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Commodity Derivative Volumes and Prices

At September 30, 2013, we had the following commodity derivatives positions outstanding:

Commodity and Period		Contract Type		Volume Transacted		Contract Price
Crude Oil
2013		Collar		650 Bbls/d		$90.00/Bbl – $105.80/Bbl
2013		Collar		450 Bbls/d		$90.00/Bbl – $101.45/Bbl
2013 (1)		Collar		1,200 Bbls/d		$90.35/Bbl – $100.35/Bbl
2014		Collar		550 Bbls/d		$90.00/Bbl – $105.50/Bbl
2014		Collar		950 Bbls/d		$85.05/Bbl – $95.05/Bbl
2015		Collar		2,600 Bbls/d		$84.00/Bbl – $91.00/Bbl
Crude Oil Basis Differential (Midland/Cushing)
2013 (2)		Swap		2,300 Bbls/d		$1.10/Bbl
2014		Swap		1,500 Bbls/d		$0.55/Bbl
Natural Gas Liquids
Propane 2013 (3)		Swap		550 Bbls/d		$42.00/Bbl
Propane 2014		Swap		500 Bbls/d		$41.16/Bbl
Natural Gasoline 2013 (3)		Swap		200 Bbls/d		$90.72/Bbl
Natural Gasoline 2014		Swap		175 Bbls/d		$83.37/Bbl
Natural Gas
2013		Swap		200,000 MMBtu/month		$3.54/MMBtu
2013		Swap		190,000 MMBtu/month		$3.80/MMBtu
2013 (4)		Collar		100,000 MMBtu/month		$4.00/MMBtu – $4.36/MMBtu
2014		Swap		360,000 MMBtu/month		$4.18/MMBtu

(1) February 2013 – December 2013

(2) March 2013 – December 2013

(3) September 2013 – December 2013

(4) May 2013 – December 2013

Summary of Fair Value of Open Commodity Derivatives

The following table summarizes the fair value of our open commodity derivatives as of September 30, 2013, and December 31, 2012 (in thousands).

		Asset/Liability Derivatives
				Fair Value
				September 30,				December 31,
		Balance Sheet Location		2013				2012
Derivatives not designated as hedging instruments
Commodity derivatives		Unrealized (loss) gain on commodity derivatives		$	(814	)		$	2,433

Summary of Changes in Fair Value of Commodity Derivatives

The following table summarizes the change in the fair value of our commodity derivatives (in thousands).

				Three Months Ended								Nine Months Ended
				September 30,								September 30,
		Income Statement Location		2013				2012				2013				2012
Derivatives not designated as hedging instruments
Commodity derivatives		Realized (loss) gain on commodity derivatives		$	(840	)		$	423			$	(1,247	)		$	300
		Unrealized (loss) gain on commodity derivatives			(3,438	)			(4,185	)			(3,248	)			2,582
				$	(4,278	)		$	(3,762	)		$	(4,495	)		$	2,882

Summary of Financial Instruments Not Recorded at Fair Value

The following table sets forth the fair values of financial instruments that are not recorded at fair value on our financial statements (in thousands).

		September 30, 2013
		Carrying Amount				Fair Value
Senior Notes		$	250,000			$	251,250

X

- Definition

Schedule Of Financial Instruments Not Measured At Fair Value [Table Text Block]

+ References

No definition available.

+ Details

Name:	arex_ScheduleOfFinancialInstrumentsNotMeasuredAtFairValueTableTextBlock
Namespace Prefix:	arex_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=7476318&loc=SL5624163-113959

+ Details

Name:	us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the notional amounts of outstanding derivative positions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

+ Details

Name:	us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- 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=7476318&loc=SL5624171-113959

+ Details

Name:	us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration