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Consolidated Statements of Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Revenues, Net From Related Parties $ 28,089us-gaap_RevenueFromRelatedParties $ 31,188us-gaap_RevenueFromRelatedParties $ 32,195us-gaap_RevenueFromRelatedParties
Technical And Operating Charges From Related Parties 0us-gaap_RelatedPartyCosts 324us-gaap_RelatedPartyCosts 620us-gaap_RelatedPartyCosts
Selling, General And Administrative Charges (Credits) From Related Parties $ 3,217us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 2,721us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ (206)us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty