Prepaid expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Chassis converter pool agreements	$ 14,641	$ 18,326
Restricted cash	9,997	0
Income tax receivables	9,557	10,821
Insurance premiums & maintenance agreements	4,991	6,860
Assets held for sale	4,011	10,777
All other	14,146	10,515
Prepaid Expense and Other Assets, Current	$ 57,343	$ 57,299

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Amount of current assets relating to chassis converter pool agreements.

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