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Selling, general and administrative expenses (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018, 2017 and 2016:

	Year Ended December 31,
	2018				2017				2016
Personnel expenses	$	132,694			$	156,726			$	149,505
Share-based compensation	95,176				107,719				102,843
Travel expenses	21,790				19,774				21,201
Professional services	24,264				28,585				30,983
Office expenses	14,784				16,105				20,703
Directors’ expenses	3,169				3,345				3,051
Other expenses	13,349				16,037				22,726
	$	305,226			$	348,291			$	351,012

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Tabular disclosure of selling, general and administrative expenses.

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