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Commitments and Contingencies (Details) (USD $) | 48 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2004 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Average Quarterly Utilization of Facility is 20% or More [Member] | Dec. 31, 2013 Average Quarterly Utilization of Facility is Less than 20% [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] One-Month London Interbank Offer Rate, Reset Daily [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] One-Month, Two-Month, Three-Month, Six-Month, or Twelve-Month London Interbank Offer Rate [Member] | Dec. 31, 2013 Unsecured Debt [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Unsecured Debt [Member] Letter of Credit Subfacility [Member] | Dec. 31, 2013 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 |
Face amount of outstanding undrawn letters of credit |  | 34,415,000 |  |  |  |  |  |  |  |
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 |  |  |  | 0.10% | 0.125% |  |  |  |  |
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 | $ 3,200,000 |  |  |  |  |  |  |

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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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Balance Type: | credit
Period Type: | instant

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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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Data Type: | num:percentItemType
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Period Type: | instant

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- Definition Outstanding Bonds Percentage Purchased + References No definition available. + Details
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- Definition 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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Namespace Prefix: | us-gaap_
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 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 2: 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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