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. 22, 2017
Dec. 21, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Examination [Line Items]          
Federal statutory income tax rate, percent 21.00% 35.00%      
Tax expense due to the tax act     $ 0 $ 6,105 $ 0
Effective income taxes     16.70% 31.20% 25.50%
Tax credits     $ 1,100 $ 858 $ 2,000
Federal          
Income Tax Examination [Line Items]          
Operating loss carryforwards     272,300    
State          
Income Tax Examination [Line Items]          
Operating loss carryforwards     267,300    
Pre-2018          
Income Tax Examination [Line Items]          
Tax carryforward     252,400    
Post-2018          
Income Tax Examination [Line Items]          
Tax carryforward     $ 19,900