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Note L - Off-balance Sheet Arrangements - Rent Expense Related to Revenue Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Rent expense related to revenue equipment $ 1,502 $ 2,332 $ 4,960 $ 7,401