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Profit Sharing Plan and Retirement Plan	12 Months Ended
Profit Sharing Plan and Retirement Plan	Dec. 31, 2017
Profit Sharing Plan and Retirement Plan [Abstract]
Profit Sharing Plan and Retirement Plan	Profit Sharing Plan and Retirement Plan We have retirement savings plans (the “Retirement Savings Plans”) for substantially all employees who have completed one year of service and are 19 years of age or older. Employees may make 401(k) contributions subject to Internal Revenue Code limitations. The Retirement Savings Plans provide for a discretionary profit sharing contribution to non-driver employees and a matching contribution of a discretionary percentage to driver employees ("Heartland Plan"). Also, we acquired Retirement Saving Plans providing for discretionary matching contributions to driver and non-driver employees in our acquisition of GTI ("GTI Plan") and IDC ("IDC Plan"). The GTI Plan was merged into the Heartland Plan on July 1, 2016 and the IDC Plan was merged into the Heartland Plan on October 1, 2017. Our profit sharing contributions the Retirement Savings Plans totaled approximately $1.8 million, $1.7 million, and $2.1 million, for the years ended December 31, 2017, 2016 and 2015, respectively.