LEASES (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
LEASES
Options to terminate the leases		true
Operating lease option to terminate Period		30 days
Fixed operating lease expense	$ 1,018	$ 3,057
Variable operating lease expense	39	118
Total operating lease expense	1,057	3,175
Supplemental cash flow information related to the operating leases
Cash paid for amounts included in the measurement of operating leases		3,101
ROU assets obtained in exchange for operating lease obligations		20,604
Lease assets and liabilities
Right of use asset	$ 17,358	$ 17,358
Right of use asset, Classification	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Right of use liability, current	$ 3,261	$ 3,261
Right of use liability, current, Classification	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Right of use liability, long-term	$ 14,107	$ 14,107
Right of use liability, long-term, Classification	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total ROU lease liabilities	$ 17,368	$ 17,368
Weighted average remaining lease term	8 years 4 months 6 days	8 years 4 months 6 days
Weighted average discount rate	2.95%	2.95%
Maturity of the operating lease liabilities
2020	$ 3,711	$ 3,711
2021	3,004	3,004
2022	2,419	2,419
2023	2,065	2,065
2024	1,682	1,682
Thereafter	6,349	6,349
Total undiscounted cash flows	19,230	19,230
Less: present value discount	(1,862)	(1,862)
Total lease liabilities	$ 17,368	$ 17,368