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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 5,698 $ 18,585
Finance lease cost:    
Amortization of right-of-use assets 1,785 5,356
Interest on lease liabilities 102 367
Total finance lease cost $ 1,887 $ 5,723