LEASES (Components of Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
LEASES [Abstract]
Amortization of right-of-use assets		$ 699	$ 369	$ 1,330	$ 673
Interest on lease liabilities		30	25	60	47
Operating lease cost		15,517	14,234	30,809	28,340
Short-term lease cost	[1]	5,345	7,676	10,447	16,721
Variable lease cost		2,779	3,773	5,470	6,905
Sublease income		(834)	(721)	(1,657)	(1,456)
Total lease cost		$ 23,536	$ 25,356	$ 46,459	$ 51,230

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