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Leases - Components of Lease Cost (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 7,649
Variable lease cost 866
Short-term lease cost 1,530
Finance lease cost:  
Amortization of right of use assets 57
Interest on lease liabilities 16
Total finance lease cost 73
Sublease income (132)
Total lease cost $ 9,986