LEASES (Schedule of Lease Assets and Liabilities, Weighted-Average Lease Term and Discount Rate) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
LEASES [Abstract]
Operating lease ROU assets	$ 483,659	$ 441,656	$ 435,986
Accumulated amortization	(52,432)	(33,467)	(25,153)
Total lease assets	431,227	408,189	410,833
Current obligations under leases	36,434	29,971	30,282
Noncurrent operating liabilities	407,336	388,042	391,079
Total lease liabilities	$ 443,770	$ 418,013	$ 421,361
Weighted-average remaining lease term, Operating leases	10 years 1 month 6 days	9 years 10 months 24 days	9 years 7 months 6 days
Weighted-average discount rate, Operating leases	3.90%	4.30%	4.40%