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Condensed Consolidating Financial Information (Details Textual) (USD $) | Dec. 31, 2012 | Jan. 01, 2012 | Aug. 31, 2010 | Dec. 31, 2012 Senior Notes Due 2012 [Member] | Aug. 12, 2010 Senior Notes Due 2012 [Member] | Dec. 31, 2012 Senior Note Due 2017 [Member] | Aug. 22, 2011 Senior Note Due 2017 [Member] | Feb. 10, 2011 Senior Note Due 2017 [Member] | Oct. 20, 2009 Senior Note Due 2017 [Member] | Dec. 31, 2012 Senior Notes Due 2021 [Member] | Feb. 10, 2011 Senior Notes Due 2021 [Member] | Oct. 20, 2009 Senior Note Issued October 20, 2009 [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes bear interest at a rate |  |  | 8.47% | 6.625% | 10.75% | 7.75% |  | 6.625% | 7.75% | 6.625% | 6.625% | 7.75%
Condensed Consolidating Financial Information (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of taxable revenue bonds | $ 49,500,000 | $ 250,000,000 |  |  |  |  | $ 300,000,000 |  |  |  | $ 300,000,000 |
Percentage of subsidiary owned | 100.00% |  |  |  |  |  |  |  |  |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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