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Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Finance lease cost    
Amortization of ROU assets $ 16 $ 48
Interest on lease liabilities 2 6
Operating lease cost 1,057 2,967
Short-term lease cost 102 330
Variable lease cost 236 657
Sublease income (2) (5)
Total lease expense $ 1,411 $ 4,003