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Consolidated Statements of Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenues, Net From Related Parties $ 6,719us-gaap_RevenueFromRelatedParties $ 7,689us-gaap_RevenueFromRelatedParties
Related Party Transaction, Expenses from Transactions with Related Party $ 949us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 659us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty