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Other non-current assets - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 16, 2014 | Jun. 30, 2015
Zim Integrated Services [Member] |  |
Equity securities received, percentage | 1.20% |
Aggregate principal amount of unsecured interest | $ 8,229 |
Equity securities received, Maturity date | Dec. 31, 2023 |
Fair value of equity securities | $ 7,802 |
Difference between aggregate fair value of debt and equity securities | $ 2,888 |
Series 1 Notes [Member] |  |
Equity securities received, percentage | 3.00% |
Aggregate principal amount of unsecured interest | $ 1,452 |
Equity securities received, Maturity date | Dec. 31, 2023 |
Fair value of equity securities | $ 676 |
Fair value unwinding |  | $ 484
Series 2 Notes [Member] |  |
Equity securities received, percentage | 5.00% |
Aggregate principal amount of unsecured interest | $ 6,777 |
Equity securities received, Maturity date | Dec. 31, 2023 |
Fair value of equity securities | $ 3,567 |
Fair value unwinding |  | $ 484

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