LEASES (Components of Lease Expense) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
LEASES [Abstract]
Amortization of right-of-use assets		$ 632	$ 304
Interest on lease liabilities		30	22
Operating lease cost		15,292	14,106
Short-term lease cost	[1]	5,102	9,059
Variable lease cost		2,691	3,132
Sublease income		(824)	(734)
Total lease cost		$ 22,923	$ 25,889

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