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INCOME TAXES (Narrative) (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |  |  |
Federal statutory income tax rate, percent | 21.00% | 35.00% |  |  |
Tax expense due to the tax act |  |  | $ 0 | $ 0 | $ 6,105,000
Effective income taxes |  |  | 16.20% | 16.70% | 31.20%
Tax credits |  |  | $ 2,900,000 | $ 1,100,000 | $ 858,000
Accruals for uncertain tax positions |  |  | 0 | $ 0 |
Federal |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | $ 222,000,000.0 |  |
Operating loss carryforwards, limitations on use |  |  | operating loss carryforwards of approximately $222.0 million, of which approximately $201.2 million under pre-2018 law can be carried forward 20 years, and $20.8 million that can be carried forward indefinitely |  |
State |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | $ 283,600,000 |  |
Operating loss carryforwards, limitations on use |  |  | operating loss carryforwards of approximately $283.6 million, of which approximately $233.2 million will begin to expire after 2026, and $50.4 million that can be carried forward indefinitely. |  |
Operating loss carryforward subject to expiration |  |  | $ 233,200,000 |  |
Operating loss carryforward not subject to expiration |  |  | $ 50,400,000 |  |
Operating loss carryforwards expiration date |  |  | Dec. 31, 2026 |  |
Pre-2018 | Federal |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax carryforward |  |  | $ 201,200,000 |  |
Post-2018 | Federal |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax carryforward |  |  | $ 20,800,000 |  |

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