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Derivative Financial Instruments (Narrative) (Details) € in Thousands, $ in Thousands | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |
Forward purchase commitment |  | $ 677,450 |  | $ 318,463
Forward sale commitment |  | 699,460 |  | 318,463
Foreign Currency Forward Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | € | € 2,750 |  | € 3,000 |
EuroDollar Futures Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount |  | 0 |  | 0
Other Extended Settlement Trades [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Forward purchase commitment |  | 3,075 |  | 3,517
Forward sale commitment |  | $ 0 |  | $ 0

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- Definition Account transaction between trade date and settlement date as a derivative as either a forward purchase commitment or a forward sale commitment due to financial instrument not settling within regular time frame. + References No definition available. + Details
Name: | ifmi_ForwardPurchaseCommitment
Namespace Prefix: | ifmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Account transaction between trade date and settlement date as a derivative as either a forward purchase commitment or a forward sale commitment due to financial instrument not settling within regular time frame. + References No definition available. + Details
Name: | ifmi_ForwardSaleCommitment
Namespace Prefix: | ifmi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_EurodollarFutureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_OtherContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |