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Commitments (Narratives) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies [Abstract]      
Rent Expenses $ 9,700,000us-gaap_OperatingLeasesRentExpenseNet $ 10,100,000us-gaap_OperatingLeasesRentExpenseNet $ 6,700,000us-gaap_OperatingLeasesRentExpenseNet
Line of credit reserve $ 621,000ofg_LineOfCreditReserve $ 900,000ofg_LineOfCreditReserve