Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]      
Gross revenue $ 390,620us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 162,401us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 39,918us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Net income (loss) $ 140,796us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 17,350us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 1,943us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss