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FAIR VALUE MEASUREMENTS (Derivative Financial Instruments) (Details) (Cashless Collar Contract [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Jun. 10, 2013
bbl
May 06, 2013
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Apr. 02, 2013
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Mar. 07, 2013
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Feb. 07, 2013
bbl
Jan. 08, 2013
bbl
Dec. 07, 2012
bbl
Nov. 09, 2012
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Oct. 04, 2012
bbl
Sep. 11, 2012
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Aug. 03, 2012
bbl
May 03, 2012
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Dec. 28, 2012
Cap $117.80 [Member]
bbl
Dec. 28, 2012
Cap $116.25 [Member]
bbl
Jun. 30, 2013
Trade Date September 11, 2012 [Member]
Jun. 30, 2013
Trade Date December 7, 2012 [Member]
Jun. 30, 2013
Trade Date, March 7, 2013 [Member]
Jun. 30, 2013
Trade Date, May 6, 2013 [Member]
Jun. 30, 2013
Trade Date May 3, 2012 [Member]
Jun. 30, 2013
Trade Date August 3, 2012 [Member]
Jun. 30, 2013
Trade Date October 4, 2012 [Member]
Jun. 30, 2013
Trade Date November 9, 2012 [Member]
Jun. 30, 2013
Trade Date January 8, 2013 [Member]
Jun. 30, 2013
Trade Date, February 7, 2012 [Member]
Jun. 30, 2013
Trade Date, April 2, 2013 [Member]
Jun. 30, 2013
Trade Date, June 10, 2013 [Member]
Jun. 30, 2013
Trade Date, December 28, 2012 [Member]
Cap $117.80 [Member]
Jun. 30, 2013
Trade Date, December 28, 2012 [Member]
Cap $116.25 [Member]
Derivative [Line Items]                                                          
Barrels of oil per Month   148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810 148,810                            
Floor   75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00 75.00                            
Cap   120.65 122.00 130.00 125.75 134.70 129.00 124.70 130.00 127.50 137.50 130.00 141.25 117.80 116.25                            
Assets, Fair Value $ 626                             $ 23 $ 25 $ 71 $ 56 $ 0 $ 7 $ 23 $ 49 $ 74 $ 118 $ 125 $ 55    
Liabilities, Fair Value $ 39                                                     $ 26 $ 13