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LEASES - Components of Lease Expense and Supplemental Cash Flow information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Lessee, Lease, Description [Line Items]    
Operating Lease Expense $ 1,720 $ 3,496
Variable Lease Expense 89 178
Sublease Income (15) (250)
Total Lease Expense 1,794 3,424
Operating leases cash paid for amounts included in the measurement of lease liabilities for operating leases: 1,738 3,619
Operating lease right of use assets recognized 1,055 4,089
ASU 2016-02    
Lessee, Lease, Description [Line Items]    
Operating lease right of use assets recognized $ 0 $ 23,332