LEASES (Components of Operating Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
LEASES [Abstract]
Operating lease cost		$ 14,837	$ 14,057	$ 43,177	$ 42,352
Short-term lease cost	[1]	8,263	8,756	25,704	25,378
Variable lease cost		3,236	3,637	10,141	10,194
Sublease income		(677)	(774)	(2,133)	(2,192)
Total lease cost		$ 25,659	$ 25,676	$ 76,889	$ 75,732

[1] Our short-term lease cost includes the cost of leases with an initial term of one month or less.