LEASES - Other Information (Details) - USD ($) $ in Thousands			6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term	3 years 8 months 12 days		3 years 8 months 12 days
Operating lease cost			$ 2,871
Weighted-average discount rate	3.70%		3.70%
Cash paid for amounts included in the measurement of lease liabilities			$ 2,247
Right of use assets obtained in exchange for new lease liabilities	$ 1,500	$ 12,600	$ 14,136
Minimum
Lessee, Lease, Description [Line Items]
Lease term	1 year		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term	9 years		9 years