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INCOME TAXES (Summary of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Ending balance—gross unrecognized tax benefits (“UTB”s) $ 17,496 $ 18,728 $ 20,137
Unrecognized tax benefits if recognized, would impact certain deferred tax assets 16,600    
Unrecognized tax benefits that would impact the annual effective tax rate if recognized 829 2,061 3,470
Decrease in provision for income taxes due to reduction of gross unrecognized tax benefits 1,200    
Accrued interest and penalties 400 400  
Unrecognized tax benefits      
Beginning balance-gross unrecognized tax benefits (UTB’s) 18,728 20,137 22,694
Lapse of statute of limitations (1,232) (1,409) (2,557)
Ending balance—gross unrecognized tax benefits (“UTB”s) 17,496 18,728 20,137
UTB’s as a credit in deferred taxes (14,604) (14,604) (14,604)
Federal benefit of state taxes $ (2,063) $ (2,063) $ (2,063)