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Significant Accounting Policies Significant Accounting Policies (Disaggregated Revenue) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disaggregated Revenue [Line Items]
Revenue from operations	$ 754,096,000	$ 707,733,000
LTL Service Revenue [Member]
Disaggregated Revenue [Line Items]
Revenue from operations	740,186,000	694,533,000
Other Service Revenue [Member]
Disaggregated Revenue [Line Items]
Revenue from operations	$ 13,910,000	$ 13,200,000

X

- 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

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- Details

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X

- Details

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