OTHER NON-OPERATING EXPENSE (Notes)

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Other Income and Other Expense Disclosure [Text Block]

16.    OTHER NON-OPERATING INCOME / EXPENSE

Other non-operating income / expense comprised the following for the years ended December 31, 2017, 2016 and 2015:

	For The Year Ended December 31,
	2017			2016			2015
Interest income	$	523		$	573		$	426
Foreign currency exchange gain / (loss), net	17,185			7,149			(11,550		)
Change in fair value of derivatives (Note 14)	(1,783		)	(10,213		)	4,848
Other income / (expense), net	396			417			(17,333		)
Total other non-operating income / (expense)	$	16,321		$	(2,074	)	$	(23,609	)