Leases - Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Lease, Cost, Total	$ 24,544	$ 21,604
Vehicle Rents and General and Other Operating [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost	21,915	20,167
Short-term lease cost	2,018	311
Depreciation and Amortization [Member]
Lessee, Lease, Description [Line Items]
Amortization of finance lease assets	438	808
Interest Expense [Member]
Lessee, Lease, Description [Line Items]
Interest on lease liabilities	$ 173	$ 318