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Transactions with Related Parties (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Transactions with Related Parties    
Aggregate amount receivable from related parties $ 26,382,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty $ 51,554,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty