CRUDE OIL AND NATURAL GAS PROPERTIES (Details) $ in Millions |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Mar. 31, 2016
USD ($)
a
$ / a
|
Mar. 31, 2015
USD ($)
a
$ / a
|
Dec. 31, 2015
USD ($)
a
|
|
| Acquisitions [Abstract] | |||
| Capital expenditures incurred but not yet paid | $ | $ 56.8 | $ 59.5 | |
| Mineral acres acquired, net (in acres) | a | 764 | 899 | |
| Average acquisition cost per net acre (in dollars per acre) | $ / a | 1,214 | 1,363 | |
| Unproved Properties [Abstract] | |||
| Unproven leasehold interests (in acres) | a | 36,973 | 38,003 | |
| Anticipated future period over which excluded costs will become subject to depletion (in years) | 5 years | ||
| Impairment costs related to expired leases subject to depletion | $ | $ 5.8 | $ 23.6 | |
| X | ||||||||||
- Definition The anticipated timing of the inclusion of the costs in the amortization computation. No definition available.
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- Definition Average cost of acquisition per net acre. No definition available.
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- Definition Net mineral acres acquired is the sum of the fractional interest purchased during the period based on working interests or other economic arrangements. No definition available.
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- Definition Impairment costs related to expired leases which are included in the depletion calculation. No definition available.
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- References No definition available.
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- Definition Unproven acreage is considered to be those lease acres on which geologic and/or engineering data similar to that used in estimates of proven; but technical, contractual, economic, or regulatory uncertainties preclude such reserves being classified as proven. No definition available.
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- References No definition available.
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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