Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Represents the amount of purchases of distributors financed through a third party financing company.

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The maturity period of highly liquid investments.

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Number of company's upfit and distribution centers subject to lease agreement.

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Amount of inventory, truck chassis floor plan expected to be sold, or consumed within one year or operating cycle, if longer.

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Fixed interest rate related to the interest rate derivative.

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Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Summary of Significant Accounting Policies - Derivatives (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) company	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financing program
Purchases of distributors financed	$ 8,497	$ 7,115	$ 7,578
Amount owed by distributors to third party financing company	7,756	3,436
Uncollectible outstanding receivables	0	0
Inventories
Truck Floor Plan Inventories, Net	4,204	7,711
Inventories - bailment pool chasis	$ 15,197	17,447
Leases
Number of companies \| company	15
Maximum
Cash and Cash Equivalents
Maturity period	3 months
Interest rate swap
Interest Rate Swap
Derivative Liability	$ (1,530)	$ (1,328)
Interest Rate Swap Effective 29 March 2018 through 31 March 2020
Interest Rate Swap
Derivative, Fixed Interest Rate	1.86%
Notional amount	$ 45,000
Interest Rate Swap Effective 29 March 2018 through 31 March 2020 \| London Interbank Offered Rate (LIBOR)
Interest Rate Swap
Derivative, Floor Interest Rate	1.00%
Interest Rate Swap Effective 31 December 2015 through 29 March 2018
Interest Rate Swap
Derivative, Fixed Interest Rate	2.67%
Notional amount	$ 90,000
Interest Rate Swap Effective 31 December 2015 through 29 March 2018 \| London Interbank Offered Rate (LIBOR)
Interest Rate Swap
Derivative, Floor Interest Rate	1.00%
Interest Rate Swap Effective 31 March 2020 through 30 June 2021
Interest Rate Swap
Derivative, Fixed Interest Rate	2.918%
Notional amount	$ 135,000
Interest Rate Swap Effective 31 March 2020 through 30 June 2021 \| London Interbank Offered Rate (LIBOR)
Interest Rate Swap
Derivative, Floor Interest Rate	1.00%