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Significant Accounting Policies Significant Accounting Policies (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disaggregated Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from operations | $ 891,117 | $ 872,987 | $ 839,912 | $ 754,096 | $ 745,738 | $ 782,611 | $ 755,435 | $ 707,733 | $ 3,358,112 | $ 2,991,517 | $ 2,972,442
LTL Service Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregated Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from operations |  |  |  |  |  |  |  |  | 3,303,611 | 2,939,572 | 2,893,683
Other Service Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregated Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from operations |  |  |  |  |  |  |  |  | $ 54,501 | $ 51,945 | $ 78,759

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- Definition [Line Items] for Disaggregated Revenue [Table] + References No definition available. + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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