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Significant Accounting Policies (Narrative) (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 07, 2012 | Aug. 23, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Significant Accounting Policies [Line Items] |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 1.5 | 1.5 |  |  |
Debt and Capital Lease Obligations |  |  | $ 240,407,000 | $ 269,185,000 |
Depreciation expenses including capital leases |  |  | 109,800,000 | 89,900,000 | 79,400,000
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 |  |  | 5,700,000 | 4,700,000 |
Amortization expense |  |  | 900,000 | 900,000 | 900,000
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 |  |  | 93,500,000 | 86,000,000 |
Long-term portions of self insurance reserve |  |  | 59,500,000 | 50,100,000 |
Advertising expense |  |  | 11,000,000 | 8,300,000 | 6,300,000
Long-term Debt, Fair Value |  |  | 247,900,000 | 276,600,000 |
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 |  |  | 400,000 |  |
Self insurance additional coverage |  |  | 200,000 |  |
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 Last payment date of self-insured long-term disability claims for non-salaried employees. + References No definition available. + Details
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- Definition Maximum self-insured long-term disability claims for employees per month. + References No definition available. + Details
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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 Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + 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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