Interest income (expense), net

3 Months Ended

12 Months Ended

Mar. 31, 2018

Dec. 31, 2017

Banking And Thrift Interest [Abstract]

Interest income (expense), net

23. Interest income (expense), net

		Three months ended March 31,
	2017				2018
Interest income	$		1,131		$	3,370
Interest expense			(6,624	)		(11,470	)
Interest income (expense), net	$		(5,493	)	$	(8,100	)

24. Interest income (expense), net

Interest income (expense), net consists of the following:

	Year ended December 31,
	2015			2016			2017
Interest income	$	8,676		$	7,247		$	8,182
Interest expense		(29,828	)		(23,431	)		(39,917	)
Loss on extinguishment of debt		(10,115	)		-			-
Interest income (expense), net	$	(31,267	)	$	(16,184	)	$	(31,735	)