LEASES (Components of Lease Expense) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
LEASES [Abstract]
Amortization of right-of-use assets		$ 1,616	$ 64
Interest on lease liabilities		(102)	(4)
Operating lease cost		58,489	56,546
Short-term lease cost	[1]	30,508	35,427
Variable lease cost		12,885	13,739
Sublease income		(2,682)	(3,108)
Total lease cost		$ 100,714	$ 102,664	$ 131,015

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