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Derivative instruments (Call Spread) (Details) - Subsidiaries - Call spread - Cash Flow Hedging $ in Thousands	Apr. 30, 2017 USD ($) $ / option
Citibank S.A.
Derivative [Line Items]
Notional Amount | $	$ 50,000
Citibank S.A. | Written
Derivative [Line Items]
Strike price (in usd per option)	4.49
Citibank S.A. | Bought
Derivative [Line Items]
Strike price (in usd per option)	3.11
JP Morgan S.A.
Derivative [Line Items]
Notional Amount | $	$ 50,000
JP Morgan S.A. | Written
Derivative [Line Items]
Strike price (in usd per option)	5.20
JP Morgan S.A. | Bought
Derivative [Line Items]
Strike price (in usd per option)	3.13

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

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+ References

No definition available.

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- Definition

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+ References

No definition available.

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