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LONG-TERM DEBT - 5% Senior Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 16, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) on extinguishment of debt   $ (1,481) $ (1,676) $ (2,493)
Senior Notes | 5% Senior Notes due 2020        
Stated interest rate   5.00%    
Early repayment of senior debt $ 280,000      
Debt Instrument, redemption price, percentage 100.00%      
Gain (loss) on extinguishment of debt       $ (1,400)