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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease costs $ 10,702 $ 19,599
Financing lease costs:    
Amortization of right-of-use assets 220 477
Interest on lease liabilities 30 55
Total financing lease costs 250 532
Variable lease costs 846 2,186
Total lease costs $ 11,798 $ 22,317