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Derivative instruments - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 31, 2020 instrument | Apr. 30, 2017 instrument
Derivative [Line Items] |  |  |  |  |
Interest paid net | $ 57,066 | $ 52,458 | $ 55,400 |  |
Derivatives not designated as hedging instruments | Forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Collected (paid) derivative Instrument | 39 | (787) | (81) |  |
Cash Flow Hedging | Forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net collections (payments) to derivative instrument hedges | 1,757 | 711 | 75 |  |
Cash Flow Hedging | Cross-currency interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest paid net | 4,031 | 8,692 | 10,671 |  |
Cash Flow Hedging | Coupon-only swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest paid net | 197 | $ 2,036 | $ 2,900 |  |
Cash Flow Hedging | Derivatives designated as hedging instruments | Forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount outstanding | $ 20,276 |  |  |  |
Cash Flow Hedging | Derivatives designated as hedging instruments | Cross-currency interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  |  | 4 |
Cash Flow Hedging | Subsidiaries | Cross-currency interest rate swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage of principal and interest collections hedged (as a percent) |  |  |  |  | 50.00%
Cash Flow Hedging | Subsidiaries | Call spread |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  |  |  | 2
Percentage of principal and interest collections hedged (as a percent) |  |  |  |  | 50.00%
Cash Flow Hedging | Subsidiaries | Coupon-only swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of instruments held | instrument |  |  |  |  | 2
Percentage of principal and interest collections hedged (as a percent) |  |  |  |  | 50.00%

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