Earnings / (Loss) Per Common Share (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Earnings Per Share [Line Items]
Unrestricted Units Exchangeable into Shares	5,324,090	[1]	5,252,198	[1]	5,269,323	[1]
Stock Compensation Plan [Member]
Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	395,457		144,401		17,424
Convertible Debt Securities [Member]
Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	732,115
Board of Directors, Vice Chairman [Member]
Earnings Per Share [Line Items]
Unrestricted Units Exchangeable into Shares	4,983,557		4,983,557		4,983,557

[1] The Operating LLC membership units not held by IFMI (that is, those held by the non-controlling interest) may be redeemed and exchanged into shares of the Company on a one-to-one basis. The 4,983,557 Operating LLC membership units held by Daniel G. Cohen are redeemable at Mr. Cohen’s option, at any time, for (i) cash in an amount equal to the average of the per share closing prices of the Company’s Common Stock for the ten consecutive trading days immediately preceding the date the Company receives Mr. Cohen’s redemption notice, or (ii) at the Company’s option, one share of the Company’s Common Stock, subject, in each case, to appropriate adjustment upon the occurrence of an issuance of additional shares of the Company’s Common Stock as a dividend or other distribution on the Company’s outstanding Common Stock, or a further subdivision or combination of the outstanding shares of the Company’s Common Stock. The Operating LLC membership units held by other members of the Operating LLC have the same redemption rights as described above. These units are not included in the computation of basic earnings per share. These units enter into the computation of diluted net income / (loss) per common share when the effect is dilutive using the if-converted method.