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Related Party Transactions (Details) (Maximum [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Maximum [Member]
   
Related Party Transaction [Line Items]    
Fees paid to related party firm, maximum $ 120 $ 120
Percentage of fee paid to related party in relation to related party's total revenue, maximum 5.00% 5.00%