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INCOME TAXES (Details 1) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryover | $ 19,947 | $ 10,382
Property and equipment | 15,645 |
Percentage depletion and contribution carryovers | 2,433 | $ 2,444
Alternative minimum tax credit carryover | 706 | 706
Equity method investment and other | 630 | 629
Deferred compensation liability | 262 | 439
Asset retirement obligations | 442 | 404
Stock-based compensation | 302 | 248
Total deferred tax assets | $ 40,367 | 15,252
Deferred tax liabilities: |  |
Property and equipment |  | $ (8,351)
Oil price risk derivatives | $ (538) |
Other | (4) | $ (3)
Total deferred tax liabilities | (542) | (8,354)
Net deferred tax assets | 39,825 | 6,898
Less valuation allowance | $ (39,825) | $ (6,898)
Net deferred tax asset |  |

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