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Shareholders' equity (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance | $ 496,142 | $ 351,576 | $ 286,890
Balance | 392,759 | 496,142 | 351,576
Accumulated other comprehensive loss |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance | (429,347) | (441,649) | (424,263)
Other comprehensive income (loss) before reclassifications | (49,526) | 10,324 | (29,014)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income | (23,393) | 1,978 | 11,628
Net current-period other comprehensive income (loss) | (72,919) | 12,302 | (17,386)
Balance | (502,266) | (429,347) | (441,649)
Foreign currency translation |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance | (436,281) | (441,081) | (431,190)
Other comprehensive income (loss) before reclassifications | (62,996) | 4,800 | (9,891)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income | 0 | 0 | 0
Net current-period other comprehensive income (loss) | (62,996) | 4,800 | (9,891)
Balance | (499,277) | (436,281) | (441,081)
Cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance | 8,359 | 305 | 7,876
Other comprehensive income (loss) before reclassifications | 13,888 | 6,462 | (18,813)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income | (23,887) | 1,592 | 11,242
Net current-period other comprehensive income (loss) | (9,999) | 8,054 | (7,571)
Balance | (1,640) | 8,359 | 305
Post-employment benefits |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance | (1,425) | (873) | (949)
Other comprehensive income (loss) before reclassifications | (418) | (938) | (310)
Net loss reclassified from accumulated other comprehensive loss to consolidated statement of income | 494 | 386 | 386
Net current-period other comprehensive income (loss) | 76 | (552) | 76
Balance | $ (1,349) | $ (1,425) | $ (873)

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