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Significant Accounting Policies (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 23, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Significant Accounting Policies [Line Items] |  |  |  |
Common stock split description | those shareholders received one additional share of common stock for every two shares owned. |  |  |
Depreciation expenses including capital leases |  | $ 89,900,000 | $ 79,400,000 | $ 93,900,000
Increase in income from continuing operations |  |  | 12,700,000 |
Increase in net income |  |  | 7,700,000 |
Other intangible assets |  | 8,100,000 | 8,100,000 |
Accumulated amortization of intangible assets |  | 4,700,000 | 3,800,000 |
Amortization expense |  | 900,000 | 900,000 | 900,000
Self insurance additional coverage |  | 200,000 |  |
Maximum self-insured long-term disability claims for employees per month |  | 3,000 |  |
Last payment date of self-insured long-term disability claims for salaried employees |  | April 2, 2010 |  |
Last payment date of self-insured long-term disability claims for non-salaried employees |  | July 1, 2011 |  |
Self-insurance reserve |  | 86,000,000 | 79,300,000 |
Long-term portions of self insurance reserve |  | 50,100,000 | 45,400,000 |
Advertising expense |  | 8,300,000 | 6,300,000 | 4,100,000
Company-owned life insurance contracts |  | 27,600,000 | 25,800,000 |
Senior notes, fair value |  | 270,300,000 | 212,300,000 |
Trailers [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives of asset, years |  | 15 |  |
Estimated previous useful lives of asset, years |  | 12 |  |
Tractors [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated average useful lives of asset, years |  | 9 |  |
Estimated previous useful lives of asset, years |  | 7 |  |
Group Health Claims [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Insurance maximum, per occurrence |  | 375,000 |  |
Workers Compensation Claims [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Insurance maximum, per occurrence |  | 1,000,000 |  |
Cargo Loss And Damage Claims [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Insurance maximum, per occurrence |  | 100,000 |  |
Bodily Injury And Property Damage [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Insurance maximum, per occurrence |  | $ 2,750,000 |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 7 -Section B -Paragraph 2, 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 + Details
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