Acquisitions - Purchase Price (Details) - Martin Transport Inc. Stock Purchase Agreement - USD ($) $ in Thousands		12 Months Ended
Jan. 02, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Purchase price	$ 135,000
Plus: Working Capital Adjustment	2,795
Less: Finance lease obligations assumed	(11,682)
Cash consideration paid	126,113
Earn - out based on performance thersholds	$ 10,000
Decrease in earn-out		$ 3,333

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