LEASES (Schedule of Lease Assets and Liabilities, Weighted-Average Lease Term and Discount Rate) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
LEASES [Abstract]
Operating lease right-of-use assets	$ 435,986
Accumulated amortization	(25,153)
Total lease assets	410,833	$ 0	$ 0
Less: Current obligations under leases	30,282
Noncurrent operating liabilities	391,079	$ 0	$ 0
Total lease liabilities	$ 421,361
Weighted-average remaining lease term, Operating leases	9 years 7 months 6 days
Weighted-average discount rate, Operating leases	4.40%