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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Chassis converter pool agreements | $ 17,767 | $ 10,164
Income tax receivables | 18,073 | 8,701
Insurance premiums & maintenance agreements | 4,384 | 3,217
Assets held for sale | 1,897 | 3,020
All other | 20,915 | 16,120
Prepaid expenses and other | $ 63,036 | $ 41,222

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220 + Details
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