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Debt Schedule of Long-Term Debt Instruments (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Senior Notes due 2022 at a fixed interest rate of 3.75% [Member] | Dec. 31, 2011 Senior Notes due 2022 at a fixed interest rate of 3.75% [Member] | Dec. 31, 2012 Senior Exchangeable Notes due 2012 at a fixed interest rate of 3.75% (retired in October 2012) | Dec. 31, 2011 Senior Exchangeable Notes due 2012 at a fixed interest rate of 3.75% (retired in October 2012) | Oct. 01, 2007 Senior Exchangeable Notes due 2012 at a fixed interest rate of 3.75% (retired in October 2012) | Dec. 31, 2012 Senior Exchangeable Notes due 2015 at a fixed interest rate of 4.50% | Dec. 31, 2011 Senior Exchangeable Notes due 2015 at a fixed interest rate of 4.50% | Dec. 31, 2012 Installment note due 2014 at a fixed interest rate of 8.64% | Dec. 31, 2011 Installment note due 2014 at a fixed interest rate of 8.64% | Dec. 31, 2012 Mortgage notes due 2017 at fixed interest rates of 4.35% | Dec. 31, 2011 Mortgage notes due 2017 at fixed interest rates of 4.35% | Dec. 31, 2012 Polution control bomd (retired in May 2012) and solid waste bond due 2020 at a variable interest rate of 1.57% at December 31, 2012 | Dec. 31, 2011 Polution control bomd (retired in May 2012) and solid waste bond due 2020 at a variable interest rate of 1.57% at December 31, 2012 | Dec. 31, 2011 Revolving credit facility borrowings due 2016 at variable interest rates of 1.19% to 3.25% at December 31, 2012 | Dec. 31, 2012 Revolving credit facility borrowings due 2016 as amended October 2012 at variable interest rates of 1.19% to 3.25% at December 31, 2012 | Dec. 31, 2012 Term Credit Agreement borrowings due 2019 at a variable interest rate of 1.71% at December 31, 2012 | Dec. 31, 2011 Term Credit Agreement borrowings due 2019 at a variable interest rate of 1.71% at December 31, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt | $ 1,270,052,000 | $ 847,339,000 | $ 325,000,000 | $ 0 | $ 0 | $ 294,622,000 |  | $ 165,821,000 | [1] | $ 163,525,000 | [1] | $ 112,500,000 | $ 112,500,000 | $ 76,731,000 | [2] | $ 88,582,000 | [2] | $ 15,000,000 | $ 38,110,000 | $ 150,000,000 | [3] | $ 275,000,000 | [3] | $ 300,000,000 | $ 0
Less: Current maturities of long-term debt | (150,000,000) | (28,110,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (150,000,000) |  |  |
Long-term debt | 1,120,052,000 | 819,229,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  | 0 | 5,378,000 |  | 6,679,000 |  | 8,975,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount due upon maturity |  |  | 325,000,000 |  | 0 | 300,000,000 | 300,000,000 | 172,500,000 |  | 172,500,000 |  |  |  | 73,500,000 |  |  |  |  |  |  |  |  |  | 300,000,000 |
Unamortized premium |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,200,000 |  | $ 4,600,000 |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.75% |  | 3.75% |  |  | 4.50% |  |  |  | 8.64% |  | 4.35% |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.57% |  |  |  |  |  | 1.71% |
Variable interest rate, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.19% |  |  |
Variable interest rate, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |
[1] | Our Senior Exchangeable Notes maturing in 2015 were discounted by $6.7 million and $9.0 million as of December 31, 2012 and 2011, respectively, but upon maturity the liability will be $172.5 million.
[2] | The mortgage notes due in 2017 were recorded at a premium of $3.2 million and $4.6 million as of December 31, 2012 and 2011, respectively. Upon maturity the liability will be $73.5 million.
[3] | Borrowings under the Revolving Credit Facility include $150 million classified in current liabilities due to the Company's intent to repay this amount in January 2013.

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: 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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 4: 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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