LEASES (Components of Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
LEASES [Abstract]
Amortization of right-of-use assets		$ 828	$ 449	$ 2,158	$ 1,122
Interest on lease liabilities		172	27	231	75
Operating lease cost		18,390	14,837	49,199	43,177
Short-term lease cost	[1]	7,717	7,787	17,878	24,507
Variable lease cost		2,225	3,236	7,696	10,141
Sublease income		(668)	(677)	(2,325)	(2,133)
Total lease cost		$ 28,664	$ 25,659	$ 74,837	$ 76,889

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