v3.19.1

INCOME TAXES (Reconciliation of Statutory Rate) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal taxes at statutory rate | $ 2,497 | $ (8,873) | $ (22,941)
State taxes, net of federal benefit | 1,663 | (1,414) | (4,982)
Change in valuation allowance | (3,330) | (104,710) | 24,522
Change in federal and state tax rate | 634 | 115,545 |
Percentage depletion | (656) | (598) | (552)
Other | (700) | (2,733) | 2,591
Total income tax expense (benefit) | $ 108 | $ (2,783) | $ (1,362)
Effective tax rate | 0.90% | 11.00% | 2.10%

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