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Derivative Instruments (Call Spread) (Details) - Subsidiaries [Member] - Call Spread [Member] $ in Millions	Dec. 31, 2017 USD ($) $ / option
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

X

- 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

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- Definition

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+ References

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- Definition

The strike price on the price risk option contract such as a put option or a call option.

+ References

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