Subsequent Events - Acquisition (Details) - Martin Transport Inc. Stock Purchase Agreement - Subsequent Event $ in Thousands	Jan. 02, 2019 USD ($)
Subsequent Event [Line Items]
Purchase price	$ 135,000
Plus: Working Capital Adjustment	2,796
Less: Capital leases assumed	(11,682)
Cash consideration paid	$ 126,114

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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