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LEASES (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
LEASES    
Options to terminate the leases   true
Operating lease option to terminate Period   30 days
Fixed operating lease expense $ 1,023 $ 2,039
Variable operating lease expense 40 79
Total operating lease expense 1,063 2,118
Supplemental cash flow information related to the operating leases    
Cash paid for amounts included in the measurement of operating leases   2,069
ROU assets obtained in exchange for operating lease obligations   20,529
Lease assets and liabilities    
Right of use asset $ 18,164 $ 18,164
Right of use asset, Classification us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent
Right of use liability, current $ 3,475 $ 3,475
Right of use liability, current, Classification us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Right of use liability, long-term $ 15,206 $ 15,206
Right of use liability, long-term, Classification us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Total ROU lease liabilities $ 18,681 $ 18,681
Weighted average remaining lease term 9 years 9 years
Weighted average discount rate 2.90% 2.90%
Maturity of the operating lease liabilities    
2020 $ 3,958 $ 3,958
2021 3,195 3,195
2022 2,612 2,612
2023 2,129 2,129
2024 1,832 1,832
Thereafter 6,992 6,992
Total undiscounted cash flows 20,718 20,718
Less: present value discount (2,037) (2,037)
Total lease liabilities $ 18,681 $ 18,681