LEASES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 07, 2020
LEASES
Options to terminate the leases	true
Operating lease option to terminate Period	30 days
Fixed operating lease expense	$ 4,548	$ 4,018
Variable operating lease expense	547	499
Short-term lease expense	234	234
Supplemental cash flow information related to the operating leases
Cash paid for amounts included in the measurement of operating leases	4,601	4,886
Right of use ("ROU") assets obtained in exchange for operating lease obligations	3,626	373
ROU assets recorded upon adoption of ASC 842, Leases		$ 20,344
ROU assets obtained in acquisitions (Note 2)	$ 2,735
Lease assets and liabilities
Right of use liabilities, current, Classification	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Weighted average remaining lease term	6 years 9 months 29 days	8 years 3 months 7 days
Weighted average discount rate	2.25%	2.91%
Maturity of the operating lease liabilities
2021	$ 5,043
2022	4,013
2023	2,935
2024	2,282
2025	2,096
Thereafter	4,606
Total undiscounted cash flows	20,975
Less: present value discount	(1,334)
Total lease liabilities	$ 19,641
Dynamic Controls
Supplemental cash flow information related to the operating leases
ROU assets obtained in acquisitions (Note 2)			$ 2,735