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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012
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Total net liability | $ 1,266,252 |
Level 1 [Member] |  |
Total net liability | 1,143,077 |
Level 2 [Member] |  |
Total net liability | 123,175 | [1]
Level 3 [Member] |  |
Total net liability |  |
Natural Gas Contracts [Member] |  |
Assets | 20,239 |
Natural Gas Contracts [Member] | Level 1 [Member] |  |
Assets |  |
Natural Gas Contracts [Member] | Level 2 [Member] |  |
Assets | 20,239 | [1]
Natural Gas Contracts [Member] | Level 3 [Member] |  |
Assets |  |
Foreign Currency Forwards [Member] |  |
Assets | 110 |
Foreign Currency Forwards [Member] | Level 1 [Member] |  |
Assets |  |
Foreign Currency Forwards [Member] | Level 2 [Member] |  |
Assets | 110 | [1]
Foreign Currency Forwards [Member] | Level 3 [Member] |  |
Assets |  |
Interest Rate Swaps [Member] |  |
Assets | 83 |
Interest Rate Swaps [Member] | Level 1 [Member] |  |
Assets |  |
Interest Rate Swaps [Member] | Level 2 [Member] |  |
Assets | 83 | [1]
Interest Rate Swaps [Member] | Level 3 [Member] |  |
Assets |  |
Oil Contracts [Member] |  |
Liabilities | 23,647 | [2]
Oil Contracts [Member] | Level 1 [Member] |  |
Liabilities |  | [2]
Oil Contracts [Member] | Level 2 [Member] |  |
Liabilities | 23,647 | [1],[2]
Oil Contracts [Member] | Level 3 [Member] |  |
Liabilities |  | [2]
Fair Value Of Long Term Debt [Member] |  |
Liabilities | 1,262,686 |
Fair Value Of Long Term Debt [Member] | Level 1 [Member] |  |
Liabilities | 1,143,077 |
Fair Value Of Long Term Debt [Member] | Level 2 [Member] |  |
Liabilities | 119,609 | [1]
Fair Value Of Long Term Debt [Member] | Level 3 [Member] |  |
Liabilities |  |
Interest Rate Swaps [Member] |  |
Liabilities | 338 |
Interest Rate Swaps [Member] | Level 1 [Member] |  |
Liabilities |  |
Interest Rate Swaps [Member] | Level 2 [Member] |  |
Liabilities | 338 | [1]
Interest Rate Swaps [Member] | Level 3 [Member] |  |
Liabilities |  |
Foreign Currency Forwards [Member] |  |
Liabilities | 13 |
Foreign Currency Forwards [Member] | Level 1 [Member] |  |
Liabilities |  |
Foreign Currency Forwards [Member] | Level 2 [Member] |  |
Liabilities | 13 | [1]
Foreign Currency Forwards [Member] | Level 3 [Member] |  |
Liabilities |  |
[1] | Unless otherwise indicated, the fair value of our Level 2 derivative instruments reflects our best estimate and is based upon exchange or over-the-counter quotations whenever they are available. Quoted valuations may not be available due to location differences or terms that extend beyond the period for which quotations are available. Where quotes are not available, we utilize other valuation techniques or models to estimate market values. These modeling techniques require us to make estimations of future prices, price correlation and market volatility and liquidity. Our actual results may differ from our estimates, and these differences could be positive or negative.
[2] | See Note 7 for additional information regarding our long term debt. The fair value of our long term debt at March 31, 2012 is as follows:Fair Value Carrying ValueTerm Loans (mature July 2015) $380,395 $379,000Revolving Credit Facility (matures July 2015) 100,000100,0002025 Notes (mature March 2025) 160,099157,830(a)2032 Notes (mature March 2032)212,500200,000(b)Senior Unsecured Notes (mature January 2016) 290,083274,960MARAD Debt (matures February 2027) (c) 119,609107,756 Total $1,262,686$1,219,546Amount excludes the related unamortized debt discount of $3.7 million. Amount excludes the related unamortized debt discount of $35.4 million.The estimated fair value of all debt, other than the MARAD debt, was determined using Level 1 inputs using the market approach. The fair value of the MARAD debt was determined using a third party evaluation of the remaining average life and outstanding principal balance of the MARAD indebtedness as compared to other governmental obligations in the marketplace with similar terms. The fair value of the MARAD Debt was estimated using Level 2 fair value inputs using the market approach.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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