Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Equity Investments Balance Sheet Disclosure) (Details)

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Equity Investments (Equity Investments Balance Sheet Disclosure) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 151,752us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets $ 181,060us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Noncurrent assets 1,419,656us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets 1,306,891us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Current liabilities 55,369us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 114,506us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Noncurrent liabilities $ 213,050us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities $ 230,062us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities