Leases (Components of our right-of-use assets) (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Finance Lease [Abstract]
Buildings and Improvements	$ 131,218
Furniture and equipment	20,965
Rental trailers and other rental equipment	115,875
Rental trucks	1,637,456
Right-of-use assets, gross	1,905,514
Less: Accumulated depreciation	(833,207)
Right of use assets, net	1,072,307
Finance Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	0
Furniture and equipment	20,965
Rental trailers and other rental equipment	115,875
Rental trucks	1,637,456
Right-of-use assets, gross	1,774,296
Less: Accumulated depreciation	(803,935)
Right of use assets, net	970,361
Operating Lease [Member]
Finance Lease [Abstract]
Buildings and Improvements	131,218
Furniture and equipment	0
Rental trailers and other rental equipment	0
Rental trucks	0
Right-of-use assets, gross	131,218
Less: Accumulated depreciation	(29,272)
Right of use assets, net	$ 101,946