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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Loss Contingencies [Line Items]          
Guarantee liability         $ 1,084
Principal transactions and other income (2,623) 289 (7,413) (4,656)  
Potential liability, assuming the restricted stock or restricted units to vest 105   105    
Guarantee Obligations [Member]
         
Loss Contingencies [Line Items]          
Guarantee liability 1,084   1,084    
Principal transactions and other income $ 1,084   $ 1,084