Annual report pursuant to Section 13 and 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
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Current assets $ 181,060us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets $ 84,107us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Noncurrent assets 1,306,891us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets 1,107,579us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Current liabilities 114,506us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 112,406us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Noncurrent liabilities $ 230,062us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities $ 110,095us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities