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Profit Sharing Plan and Retirement Plan	12 Months Ended
Profit Sharing Plan and Retirement Plan	Dec. 31, 2015
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 “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 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) and discretionary matching contributions to driver and non-driver employees (GTI Plan). Our profit sharing contributions totaled approximately $2.1 million, $2.1 million, and $0.4 million, for the years ended December 31, 2015, 2014 and 2013, respectively.