Operating Leases Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense Revenue Equipment	$ 300	$ 5,000	$ 8,000
Terminal Facilities [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	2,500	4,800	3,900
Terminal Facilities [Member] | Related Party [Member]
Operating Leased Assets [Line Items]
Operating Leases, Rent Expense	$ 0	$ 800	$ 1,600