LEASES (Details) - USD ($) Unit12 in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Mar. 31, 2018
LEASES
Operating lease right-of-use asset	$ 68,185
Short-term lease liability	8,351
Long-term lease liability	$ 58,835
Cumulative effect adjustment due to adoption of new accounting			$ 2,635
Package of practical expedients	true
Hindsight practical expedient	true
Interest cost applicable to financing leases	$ 0
Lease liability applicable to financing leases	$ 0
Discount rate applicable to financing leases	0.00%
Operating lease, existence of option to extend	true
Finance lease, existence of option to extend	true
Minimum
LEASES
Operating lease, lease term	3 years
Finance lease, lease term	3 years
Maximum
LEASES
Operating lease, lease term	10 years
Finance lease, lease term	10 years
Restatement Adjustment | ASC 842
LEASES
Operating lease right-of-use asset		$ 70,800
Short-term lease liability		8,200
Long-term lease liability		61,200
Cumulative effect adjustment due to adoption of new accounting		$ 0