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Derivative instruments - Call Spread (Details) - Subsidiaries - Call spread - Cash Flow Hedging $ in Thousands | Apr. 30, 2017 USD ($) $ / option
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Derivatives designated as hedging instruments | Citibank S.A. |
Derivative [Line Items] |
Nominal Amount | $ | $ 50,000
Derivatives designated as hedging instruments | Citibank S.A. | Written |
Derivative [Line Items] |
Strike price (in usd per option) | 4.49
Derivatives designated as hedging instruments | Citibank S.A. | Bought |
Derivative [Line Items] |
Strike price (in usd per option) | 3.11
Derivatives designated as hedging instruments | JP Morgan S.A. |
Derivative [Line Items] |
Nominal Amount | $ | $ 50,000
Derivatives designated as hedging instruments | JP Morgan S.A. | Written |
Derivative [Line Items] |
Strike price (in usd per option) | 5.20
Derivatives designated as hedging instruments | JP Morgan S.A. | Bought |
Derivative [Line Items] |
Strike price (in usd per option) | 3.13
Derivatives not designated as hedging instruments | JP Morgan S.A. |
Derivative [Line Items] |
Nominal Amount | $ | $ 30,000
Derivatives not designated as hedging instruments | JP Morgan S.A. | Written |
Derivative [Line Items] |
Strike price (in usd per option) | 5.62
Derivatives not designated as hedging instruments | JP Morgan S.A. | Bought |
Derivative [Line Items] |
Strike price (in usd per option) | 8.20

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- 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 https://asc.fasb.org/extlink&oid=125515794&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 https://asc.fasb.org/extlink&oid=125515794&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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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