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Permanent Equity Schedule Of Effects Of Changes In Ownership Interest Subsidiary) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Permanent Equity [Abstract]        
Net income / (loss) attributable to IFMI $ (104) $ 2,008 $ (9,306) $ (3,929)
Increase in IFMI's paid in capital for the acquisition / (surrender) of additional units of consolidated subsidiary, net     2,705 804
Changes from net income / (loss) attributable to IFMI and transfers (to) from non-controlling interest     $ (6,601) $ (3,125)