LEASES (Components of Operating Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
LEASES [Abstract]
Operating lease cost		$ 14,234	$ 14,167	$ 28,340	$ 28,294
Short-term lease cost	[1]	8,070	7,922	17,441	16,623
Variable lease cost		3,773	3,489	6,905	6,557
Sublease income		(721)	(807)	(1,456)	(1,418)
Total lease cost		$ 25,356	$ 24,771	$ 51,230	$ 50,056

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