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Equity Investees (Schedule Of Operations For Equity Investees) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]    
Revenues $ 72,090us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 49,824us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating income 48,113us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems 30,475us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Net income $ 46,917us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 29,706us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss