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Long-Term Debt (Fair Value And Carrying Value Of Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2011 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2002 7.20% Senior Notes, Payable April 15, 2012 [Member] | Sep. 29, 2012 7.20% Senior Notes, Payable April 15, 2012 [Member] | Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2012 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2011 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2012 Five Year Senior Secured Credit Facility, Due July 8, 2016 [Member] | Dec. 31, 2011 Five Year Senior Secured Credit Facility, Due July 8, 2016 [Member] | Dec. 31, 2012 Fair Value [Member] | Dec. 31, 2011 Fair Value [Member] | Dec. 31, 2012 Fair Value [Member] 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2011 Fair Value [Member] 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2012 Fair Value [Member] 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2011 Fair Value [Member] 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2012 Fair Value [Member] Five Year Senior Secured Credit Facility, Due July 8, 2016 [Member] | Dec. 31, 2011 Fair Value [Member] Five Year Senior Secured Credit Facility, Due July 8, 2016 [Member] | Dec. 31, 2012 Carrying Value [Member] | Dec. 31, 2011 Carrying Value [Member] | Dec. 31, 2012 Carrying Value [Member] 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2011 Carrying Value [Member] 7.20% Senior Notes, Payable April 15, 2012 [Member] | Dec. 31, 2012 Carrying Value [Member] 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2011 Carrying Value [Member] 6.125% Notes, Payable January 15, 2016 [Member] | Dec. 31, 2012 Carrying Value [Member] Five Year Senior Secured Credit Facility, Due July 8, 2016 [Member] | Dec. 31, 2011 Carrying Value [Member] Five Year Senior Secured Credit Facility, Due July 8, 2016 [Member] | Dec. 31, 2012 Secured Credit Facility [Member] | Dec. 31, 2012 Secured Credit Facility [Member] Fair Value [Member] | Dec. 31, 2011 Secured Credit Facility [Member] Fair Value [Member] | Dec. 31, 2012 Secured Credit Facility [Member] Carrying Value [Member] | Dec. 31, 2011 Secured Credit Facility [Member] Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 336,606 | $ 1,011,600 | $ 963,900 | $ 153,875 | $ 298,000 |  |  | $ 0 | $ 336,270 | $ 900,000 | $ 900,000 | $ 153,875 | $ 298,000 |  |  |  |  |
Utilized borrowings under credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 280,000 | 280,000 | 0 | 280,000 | 0
Industrial revenue bonds, capital leases and other |  |  |  |  |  |  |  |  |  |  |  | 49,067 | 52,169 |  |  |  |  |  |  | 49,067 | 52,169 |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  |  |  |  |  |  | 1,494,542 | 1,650,675 |  |  |  |  |  |  | 1,382,942 | 1,586,439 |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | 55,213 | 386,255 |  |  |  |  |  |  |  |  |  | 55,213 | 386,591 |  |  |  |  |  |  | 55,213 | 386,255 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion |  |  |  |  |  |  |  |  |  |  |  | $ 1,439,329 | $ 1,264,084 |  |  |  |  |  |  | $ 1,327,729 | $ 1,200,184 |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  | 7.20% | 7.20% | 7.20% | 7.20% | 6.125% | 6.125% | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable, maturity date |  |  | Apr. 15, 2012 | Apr. 15, 2012 | Apr. 15, 2012 |  | Jan. 15, 2016 | Jan. 15, 2016 | Jan. 15, 2016 | Jul. 08, 2016 | Jul. 08, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of line of credit (years) |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Industrial revenue bonds capital leases and other fair value. + References No definition available. + Details
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- Definition Long term debt and capital lease obligations non current fair value. + References No definition available. + Details
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- Definition Term of line of credit. + References No definition available. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. + Details
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- Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + 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 This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents notes payable as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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