Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Selling, general and administrative expenses (Details)

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Selling, general and administrative expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Selling, General and Administrative Expense [Abstract]      
Personnel expenses $ 122,453 $ 132,694 $ 156,726
Share-based compensation 69,410 95,176 107,719
Professional services 24,287 24,264 28,585
Travel expenses 17,604 21,790 19,774
Office expenses 14,095 14,784 16,105
Directors’ expenses 3,042 3,169 3,345
Other expenses 16,567 13,349 16,037
Total selling, general and administrative expenses $ 267,458 $ 305,226 $ 348,291