Quarterly report pursuant to Section 13 or 15(d)

Equity Investments (Equity Investment Income Statement Disclosure) (Details)

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Equity Investments (Equity Investment Income Statement Disclosure) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]    
Gross revenue $ 133,556us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 158,281us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Net income $ 90,668us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 181,505us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss