Selected Balance Sheet Information (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2003
Schedule of Equity Method Investments [Line Items]
Accrued Liabilities, Current	$ 490,260,000us-gaap_AccruedLiabilitiesCurrent	$ 516,628,000us-gaap_AccruedLiabilitiesCurrent
Deferred income taxes	49,809,000us-gaap_DeferredTaxAssetsNetCurrent	61,589,000us-gaap_DeferredTaxAssetsNetCurrent
Equity Method Investment, Significant Property, Plant and Equipment Owned by Equity Method Investee	75.00%
Equity Method Investments	32,624,000us-gaap_EquityMethodInvestments	37,462,000us-gaap_EquityMethodInvestments
Medusa Spar LLC Investment [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of equity method investment	50.00%
Equity Method Investment, Aggregate Cost			43,700,000
Equity Method Investment, Significant Property, Plant and Equipment Owned by Equity Method Investee	75.00%
Equity Method Investments	$ 32,553,000	$ 37,376,000

Equity Method Investment, Significant Property, Plant and Equipment Owned by Equity Method Investee

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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