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Noncontrolling Interest	6 Months Ended
Noncontrolling Interest	Jun. 30, 2019
Noncontrolling Interest [Abstract]
Noncontrolling Interest	4. Noncontrolling Interest In June 2019, we purchased the remaining 10% noncontrolling interest of Total Transportation of Mississippi for a purchase price of $8.7 million. The book value of the noncontrolling interest prior to the equity purchase was $3.5 million and the remaining $5.2 million was a reduction to additional paid in capital.