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Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |
Depreciation expenses including capital leases | $ 189,600,000 | $ 164,800,000 | $ 145,800,000
Self-insurance reserve | 125,800,000 | 119,200,000 |
Long-term portions of self insurance reserve | 78,400,000 | 74,300,000 |
Advertising expense | 20,500,000 | 22,900,000 | $ 19,300,000
Debt and Capital Lease Obligations | 104,975,000 | 133,805,000 |
Long-term Debt, Fair Value | 108,300,000 | $ 139,100,000 |
Group Health Claims [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Insurance maximum, per occurrence | 800,000 |  |
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 |  |
Corridor Deductible | 2,500,000 |  |
Insurance Layer to Meet Corridor Deductible | 5,000,000 |  |
2016 Share Repurchase Program [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | 250,000,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 200,000,000 |  |
2014 Share Repurchase Program [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount | $ 200,000,000 |  |

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- Definition One-time, aggregate corridor deductible on a claim that reaches an insurance layer. + References No definition available. + Details
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- Definition Minimum insurance layer prior to meeting the one-time corridor deductible. + 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 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 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 Reference 2: 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 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + 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 Carrying amount 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 that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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