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Fair Value Measurements (Summary of Carrying and Fair Values of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  |  |  |
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Sep. 30, 2014 3.60% Senior Notes Due 2022 | Sep. 30, 2014 3.60% Senior Notes Due 2022 Carrying Value | Dec. 31, 2013 3.60% Senior Notes Due 2022 Carrying Value | Sep. 30, 2014 3.60% Senior Notes Due 2022 Fair Value | Dec. 31, 2013 3.60% Senior Notes Due 2022 Fair Value | Sep. 30, 2014 6 1/2% Senior Notes Due 2029 | Sep. 30, 2014 6 1/2% Senior Notes Due 2029 Carrying Value | Dec. 31, 2013 6 1/2% Senior Notes Due 2029 Carrying Value | Sep. 30, 2014 6 1/2% Senior Notes Due 2029 Fair Value | Dec. 31, 2013 6 1/2% Senior Notes Due 2029 Fair Value | Sep. 30, 2014 6 3/4% Senior Notes Due 2032 | Sep. 30, 2014 6 3/4% Senior Notes Due 2032 Carrying Value | Dec. 31, 2013 6 3/4% Senior Notes Due 2032 Carrying Value | Sep. 30, 2014 6 3/4% Senior Notes Due 2032 Fair Value | Dec. 31, 2013 6 3/4% Senior Notes Due 2032 Fair Value | Sep. 30, 2014 2035 GO Zone 6 1/2% Notes | Sep. 30, 2014 2035 GO Zone 6 1/2% Notes Carrying Value | Dec. 31, 2013 2035 GO Zone 6 1/2% Notes Carrying Value | Sep. 30, 2014 2035 GO Zone 6 1/2% Notes Fair Value | Dec. 31, 2013 2035 GO Zone 6 1/2% Notes Fair Value | Sep. 30, 2014 2035 IKE Zone 6 1/2% Notes | Sep. 30, 2014 2035 IKE Zone 6 1/2% Notes Carrying Value | Dec. 31, 2013 2035 IKE Zone 6 1/2% Notes Carrying Value | Sep. 30, 2014 2035 IKE Zone 6 1/2% Notes Fair Value | Dec. 31, 2013 2035 IKE Zone 6 1/2% Notes Fair Value | Sep. 30, 2014 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 | Sep. 30, 2014 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Carrying Value | Dec. 31, 2013 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Carrying Value | Sep. 30, 2014 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Fair Value | Dec. 31, 2013 Loan Related To Tax-Exempt Waste Disposal Revenue Bonds Due 2027 Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity | 2022 |  |  |  |  | 2029 |  |  |  |  | 2032 |  |  |  |  | 2035 |  |  |  |  | 2035 |  |  |  |  | 2027 |  |  |  |
Stated interest rate | 3.60% |  |  |  |  | 6.50% |  |  |  |  | 6.75% |  |  |  |  | 6.50% |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |
Senior notes |  | $ 249,079 | $ 248,990 | $ 247,633 | $ 236,905 |  | $ 100,000 | $ 100,000 | $ 114,624 | $ 109,490 |  | $ 250,000 | $ 250,000 | $ 275,313 | $ 265,148 |  | $ 89,000 | $ 89,000 | $ 101,855 | $ 94,606 |  | $ 65,000 | $ 65,000 | $ 74,389 | $ 69,094 |  |  |  |  |
Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,889 | $ 10,889 | $ 10,889 | $ 10,889

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References No definition available. + Details
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- Definition Debt Instrument, Maturity + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents senior notes as of the balance sheet date. + References No definition available. + Details
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