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Derivative instruments - Call Spread (Details) - Subsidiaries - Derivatives designated as hedging instruments - Call spread - Cash Flow Hedging $ in Thousands | Apr. 30, 2017 USD ($) $ / option
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Citibank S.A. |
Derivative [Line Items] |
Nominal 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] |
Nominal 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

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