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TRANSACTIONS WITH RELATED PARTIES AND AFFILIATES - Balance due to related parties (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Balance due to related parties    
Amounts due to related parties $ 14,925 $ 21,748
Management fees due to related parties 14,153  
Administrative service expenses and other expenses due to related parties $ 772