DERIVATIVE FINANCIAL INSTRUMENTS - Balance Sheet Location (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair value of net derivatives
Derivative Assets, current	$ 11,081	$ 4,005
Commodity derivatives \| Not designated as hedging instruments
Fair value of net derivatives
Derivative Assets	11,081
Derivative Liabilities, current		4,005
Commodity derivatives \| Not designated as hedging instruments \| Natural Gas
Fair value of net derivatives
Derivative Assets, current	7,816
Derivative Instruments and Hedges, Liabilities		3,611
Commodity derivatives \| Not designated as hedging instruments \| Oil
Fair value of net derivatives
Derivative Assets, current	$ 3,265
Derivative Instruments and Hedges, Liabilities		$ 394

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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