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Selling, general and administrative expenses (Tables)

12 Months Ended

Dec. 31, 2019

Selling, General and Administrative Expense [Abstract]

Schedule of selling, general and administrative expenses

Selling, general and administrative expenses consisted of the following for the years ended December 31, 2019, 2018 and 2017:

	Year Ended December 31,
	2019				2018				2017
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
	$	267,458			$	305,226			$	348,291

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Tabular disclosure of selling, general and administrative expenses.

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