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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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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

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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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