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Commitments And Contingencies (Details) (USD $) | 48 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2004 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] One-Month London Interbank Offer Rate, Reset Daily [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] One-Month, Two-Month, Three-Month, Six-Month, or Twelve-Month London Interbank Offer Rate [Member] | Dec. 31, 2012 Unsecured Debt [Member] Revolving Credit Facility [Member] | Dec. 31, 2012 Unsecured Debt [Member] Letter of Credit Subfacility [Member] | Dec. 31, 2012 Swing Line Loans [Member] One-Month London Interbank Offer Rate, Reset Daily [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 125,000,000 | $ 40,000,000 |
Outstanding undrawn amount of letter of credit to insurance carrier |  | 29,250,000 |  |  |  |  |  |  |  |
Credit facility, amount outstanding |  | 0 |  |  |  |  |  |  |  |
Interest percentage over LIBOR rate |  |  |  |  |  | 0.875% | 0.875% |  |  | 0.875%
Percentage fee paid for unused portion of line of credit (minimum if quarterly utilization of the facility is less than 20%, maximum if quarterly utilization of the facility is 20% or more) |  |  |  | 0.125% | 0.10% |  |  |  |  |
Commission fee on amount available to be drawn on letter of credit subfacility |  |  |  |  |  |  |  |  | 0.875% |
Issuance fee as percent of face amount |  |  |  |  |  |  |  |  | 0.075% |
Percentage purchase of outstanding IRB bonds | 100.00% |  |  |  |  |  |  |  |  |
Investment in and outstanding debt for industrial revenue bond |  | $ 3,200,000 | $ 9,733,000 |  |  |  |  |  |  |

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- Definition Outstanding debt for industrial revenue bond IRB in which the company purchased 100% of the outstanding bonds under the IRB at par. In addition to purchasing the outstanding obligations, the company has a right of offset included in the IRB debt agreement. Accordingly, the company has netted the impact of the IRB in the accompanying consolidated financial statements. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the letter of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Line of Credit Facility, Issuance Fee as Percent of Face Amount + References No definition available. + Details
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- Definition Outstanding Bonds Percentage Purchased + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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