LEASES (Components of Lease Expense and Supplemental Cash Flow Information) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Components of lease expense
Operating lease cost	$ 5,997	$ 11,859
Supplemental cash flow information:
Cash paid for amounts included in the measurement of lease liabilities	5,199	10,016
Supplemental non-cash information related to lease liabilities arising from obtaining right-of-use assets	$ 1,545	$ 2,862
Weighted average remaining lease term	6 years 7 months 6 days	6 years 7 months 6 days
Weighted average discount rate	3.22%	3.22%