Leases - Sale leaseback (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Sale Leaseback Transaction [Line Items]
Operating lease right of use assets	$ 276,618
Operating lease liability	276,223
Rent expense, noncancelable operating leases		$ 78,500	$ 75,700
Maximum residual value guarantee	$ 91,500
Sale Leaseback Transaction 2019 Involving Three Terminals [Member]
Sale Leaseback Transaction [Line Items]
Number of terminals | item	3
Sale proceeds	$ 23,500
Lease term	15 years
Annual rate	$ 1,700
Annual increase, as a percent	1.70%
Operating lease right of use assets	$ 20,800
Operating lease liability	20,800
Sale leaseback gain	$ 1,200