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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
State tax expense $ 3,682,000 $ 4,147,000 $ 3,772,000  
Current tax benefit (provision) (485,000) (1,354,000) 6,459,000  
Deferred tax benefit (provision) (2,668,000) 2,905,000 (4,526,000)  
Income tax benefit (provision) (3,153,000) 1,551,000 $ 1,933,000  
Net deferred tax asset $ 15,117,000 $ 20,133,000    
Accounting Standards Update 2016-16        
Revenue Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect of accounting change       $ 11,433,000