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LEASES - Components of Lease Expense and Supplemental Cash Flow information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lessee, Lease, Description [Line Items]    
Operating Lease Expense $ 1,557 $ 5,053
Variable Lease Expense 89 267
Sublease Income 0 (250)
Total Lease Expense 1,646 5,070
Operating leases cash paid for amounts included in the measurement of lease liabilities for operating leases: 1,673 5,292
Operating lease right of use assets recognized 1,243 5,332
ASU 2016-02    
Lessee, Lease, Description [Line Items]    
Operating lease right of use assets recognized $ 0 $ 23,332