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Subsequent Event Subsequent Event (Details) (Subsequent Event, USD $) | 0 Months Ended |
--- | --- | ---
Mar. 12, 2013 | Feb. 28, 2013
Subsequent Event [Line Items] |  |
Unsecured revolving credit facility, current borrowing capacity | $ 200,000,000.0 |
Unsecured revolving credit facility, expiration date | Mar. 12, 2016 |
Unsecured revolving credit facility, contingent expiration, senior notes threshold | 200,000,000 |
Unsecured revolving credit facility, maximum borrowing capacity | 300,000,000 |
Unsecured revolving credit facility, significant subsidiary threshold | 5.00% |
Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent | 10.00% |
Number of additional guarantor subsidiaries |  | 12
Letter of Credit |  |
Subsequent Event [Line Items] |  |
Unsecured revolving credit facility, maximum borrowing capacity | $ 100,000,000 |

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- Definition Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent + References No definition available. + Details
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- Definition Line of Credit Facility, Significant Subsidiary Threshold, Percent + References No definition available. + Details
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- Definition Number of Additional Guarantor Subsidiaries + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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 Date the credit facility terminates, in CCYY-MM-DD format. + 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 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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