LEASES (Components of Lease Expenses) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lease, Cost [Line Items]
Total lease cost	$ 16,259
Selling, general and administrative expenses
Lease, Cost [Line Items]
Operating lease cost	13,719
Variable lease cost	2,097
Short-term lease cost	898
Interest and other income, net
Lease, Cost [Line Items]
Sublease income	$ (455)