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Revenue from Contract with Customers - Contract Balances (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue
Accounts receivable, trade	$ 141,781	$ 121,299	$ 113,416
Contract liability with customer	13,300	9,000
Increase in contract liability from freight billing and after market services	21,800
Revenue from contract liability	17,400
Contract with customers
Disaggregation of Revenue
Accounts receivable, trade	$ 136,800	$ 115,600

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- Definition

Contract with Customer Liability Increase from Freight Billing and Aftermarket Services

+ References

No definition available.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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-Publisher FASB
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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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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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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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