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Other comprehensive income (loss) and accumulated other comprehensive items - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | $ 528,734 | $ 594,330
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | (8,031) | 568
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | (8,031) | 568
Balance at the end of the period | 572,494 | 572,494
Unrealized Gains/(Losses) On Marketable Securities, net of tax |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | 692 | 755
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | 2,718 | 2,655
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | 2,718 | 2,655
Balance at the end of the period | 3,410 | 3,410
Foreign Currency Translation |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | (2,677) | (11,339)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Other comprehensive income before reclassifications | (10,749) | (2,087)
Amounts reclassified from other comprehensive items | 0 | 0
Other comprehensive income (loss) | (10,749) | (2,087)
Balance at the end of the period | (13,426) | (13,426)
AOCI Attributable to Parent |  |
Other comprehensive income (loss) and accumulated other comprehensive items |  |
Balance at the beginning of the period | (1,985) | (10,584)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Balance at the end of the period | $ (10,016) | $ (10,016)

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