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Derivative Instruments (Call Spread) (Details) - Subsidiaries [Member] - Call Spread [Member] $ in Millions | Dec. 31, 2017 USD ($) $ / option
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Citibank S.A. [Member] |
Derivative [Line Items] |
Notional Amount | $ | $ 50.0
Citibank S.A. [Member] | Written [Member] |
Derivative [Line Items] |
Strike price (in usd per option) | 4.49
Citibank S.A. [Member] | Bought [Member] |
Derivative [Line Items] |
Strike price (in usd per option) | 3.11
JP Morgan S.A. [Member] |
Derivative [Line Items] |
Notional Amount | $ | $ 50.0
JP Morgan S.A. [Member] | Written [Member] |
Derivative [Line Items] |
Strike price (in usd per option) | 5.20
JP Morgan S.A. [Member] | Bought [Member] |
Derivative [Line Items] |
Strike price (in usd per option) | 3.13

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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
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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
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- Definition The strike price on the price risk option contract such as a put option or a call option. + References No definition available. + Details
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- Details
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- Details
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- Details
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