LEASES (Components of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases
Operating lease expense	$ 5,339
Variable lease expense	839
Sublease income	(67)
Total operating lease expense	6,111
Operating cash flows included in the measurement of lease liabilities	$ 5,290
Rental expense for operating leases		$ 5,000