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Condensed Consolidating Financial Information (Details Textual) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Aug. 31, 2010 | Mar. 19, 2013 5.125% Senior Notes Senior Notes | Dec. 31, 2013 6.625% Senior Notes Senior Notes | Mar. 19, 2013 6.625% Senior Notes Senior Notes | Feb. 10, 2011 6.625% Senior Notes Senior Notes | Oct. 03, 2013 5.875% Senior Notes Senior Notes
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Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 8.47% | 5.125% | 6.625% | 6.625% | 6.625% | 5.875%
Aggregate principal amount of taxable revenue bonds |  |  | $ 300,000 |  |  | $ 300,000 | $ 250,000
Percentage of subsidiary owned | 100.00% |  |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + 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 + Details
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