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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
State tax expense $ 4,147 $ 3,772 $ 3,458  
Current tax benefit (provision) (1,354) 6,459 1,156  
Deferred tax benefit (provision) 2,905 (4,526) 907  
Income tax benefit 1,551 1,933 $ 2,063  
Net deferred tax asset 20,133 $ 7,120    
Reduction in deferred tax assets related to the TCJA $ 2,309      
Accounting Standards Update 2016-16        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect of accounting change       $ 11,433