LEASES (Lease Costs and Other Information) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 15,097	$ 44,776
Short-term lease cost	982	2,729
Variable lease cost	6,643	13,932
Total lease costs	$ 22,722	61,437
Cash paid for operating leases		48,569
Right-of-use assets obtained in exchange for operating lease liabilities		$ 222,401
Weighted average remaining lease term (in years)	6 years 1 month 6 days	6 years 1 month 6 days
Weighted average discount rate (percent)	4.80%	4.80%