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Leases - Net Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Net lease expense    
Operating lease expense $ 2,284 $ 6,887
Short-term lease expense 111 365
Variable lease expense 795 1,842
Amortization of right-of-use assets 1 2
Interest on lease liabilities   1
Total finance lease expense 1 3
Less: Sublease income (268) (766)
Net lease expense $ 2,923 $ 8,331