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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Leases [Abstract]          
Right-of-use operating lease assets $ 230,650   $ 230,650   $ 241,342
Operating Lease, Liability, Current 37,763   37,763   38,296
Operating Lease, Liability, Noncurrent         257,424
Finance Lease, Right-of-Use Asset 237,502   237,502   170,155
Finance Lease, Liability, Current 89,694   89,694   63,454
Finance Lease, Liability, Noncurrent 110,098   110,098   $ 96,183
Operating Lease Expense, Net 14,239 $ 14,849 28,546 $ 29,853  
Finance Lease, Right-of-Use Asset, Amortization 12,738 6,960 24,312 11,420  
Finance Lease, Interest Expense 2,121 1,477 4,222 2,504  
Finance Lease, Cost 14,859 8,437 28,534 13,924  
Finance And Operating Lease, Lessee Expense $ 29,098 $ 23,286 57,080 43,777  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability     11,215 15,430  
Finance Lease, Interest Payment on Liability     4,222 2,504  
Operating Lease, Payments     $ 29,705 $ 32,126  
Operating Lease, Weighted Average Remaining Lease Term 8 years 8 months 12 days 9 years 3 months 18 days 8 years 8 months 12 days 9 years 3 months 18 days  
Finance Lease, Weighted Average Remaining Lease Term 2 years 3 months 18 days 2 years 10 months 24 days 2 years 3 months 18 days 2 years 10 months 24 days  
Operating Lease, Weighted Average Discount Rate, Percent 5.59% 5.86% 5.59% 5.86%  
Finance Lease, Weighted Average Discount Rate, Percent 5.04% 5.66% 5.04% 5.66%