Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Narrative) (Details)

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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