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Note L - Rent Expense Related to Revenue Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Rent expense related to revenue equipment $ 2,469 $ 2,668 $ 4,957 $ 5,342