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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
State tax expense $ 3,772 $ 3,458 $ 3,460
Current tax benefit (provision) 6,459 1,156 (3,093)
Deferred tax benefit (provision) (4,526) 907 152
Income tax benefit (provision) 1,933 2,063 $ (2,941)
Net deferred tax asset 7,120 $ 5,841  
Tax Cuts and Jobs Act of 2017, reduction in deferred tax assets $ 2,309