Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Narrative) (Details)

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INCOME TAXES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Examination [Line Items]      
Effective income taxes 15.10% 16.20% 16.70%
Tax credits $ 3,000 $ 2,900 $ 1,100
Accruals for uncertain tax positions 0 $ 0  
Federal      
Income Tax Examination [Line Items]      
Operating loss carryforwards $ 165,200    
Operating loss carryforwards, limitations on use operating loss carryforwards of approximately $165.2 million, of which approximately $144.4 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 $ 334,100    
Operating loss carryforwards, limitations on use operating loss carryforwards of approximately $334.1 million, of which approximately $226.1 million will begin to expire after 2026, and $108 million that can be carried forward indefinitely.    
Operating loss carryforward subject to expiration $ 226,100    
Operating loss carryforward not subject to expiration $ 108,000    
Operating loss carryforwards expiration date Dec. 31, 2026    
Pre-2018 | Federal      
Income Tax Examination [Line Items]      
Tax carryforward $ 144,400    
Post-2018 | Federal      
Income Tax Examination [Line Items]      
Tax carryforward $ 20,800