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Equity Investees (Schedule Of Operations For Equity Investees) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]      
Revenues $ 246,265us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 183,533us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 162,267us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating Income 146,760us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems 102,107us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems 80,841us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Net Income $ 142,754us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 99,357us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 77,975us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss