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OPERATING SEGMENT DATA - (Operating Expenses) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
OPERATING EXPENSES |  |  |  |  |  |  |  |  |  |  |  |
Salaries, wages, and benefits |  |  |  |  |  |  |  |  |  | $ 1,398,348 | $ 1,361,224 | $ 1,340,577
Rents, purchased transportation, and other costs of services |  |  |  |  |  |  |  |  |  | 989,006 | 869,584 | 823,683
Fuel, supplies, and expenses |  |  |  |  |  |  |  |  |  | 325,126 | 304,126 | 270,138
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 108,635 | 103,068 | 103,053
Other |  |  |  |  |  |  |  |  |  | 123,998 | 124,144 | 118,390
Multiemployer pension fund withdrawal liability charge |  |  |  | $ 37,900 |  |  |  |  |  | 37,922 |  |
Restructuring costs |  |  |  |  |  |  |  |  |  | 1,655 | 2,963 | 10,313
Total consolidated operating expenses |  | $ 737,117 | $ 770,103 | $ 790,194 | $ 687,276 | $ 691,982 | $ 717,538 | $ 694,601 | $ 660,988 | $ 2,984,690 | $ 2,765,109 | $ 2,666,154
Asset-Based | Multiemployer pension plans | New England Pension Fund |  |  |  |  |  |  |  |  |  |  |  |
OPERATING EXPENSES |  |  |  |  |  |  |  |  |  |  |  |
Multiemployer pension fund withdrawal liability charge | $ 37,900 |  |  |  |  |  |  |  |  |  |  |

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- Definition Fuel costs incurred that are directly related to services rendered during the reporting period and the cost of materials used in services rendered during the reporting period. It also includes costs related to selling products and services, as well as other general and administrative expenses not separately disclosed in operating expenses and costs. + References No definition available. + Details
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- Definition Amount of pre-tax expenses associated with multiemployer pension fund withdrawal liability. + References No definition available. + Details
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- Definition This element represents expenses of rent, transportation services, and other costs of services purchased from third parties. + References No definition available. + Details
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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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