Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Measurements [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table details financial assets measured and recorded at fair value on a recurring basis:

		As of December 31, 2018
(in thousands)	Balance Sheet Classification	Level 1		Level 2			Level 3		Total
Assets
Foreign currency exchange contracts	Other current assets	$	—	$	44,637		$	—	$	44,637
Liabilities
Foreign currency exchange contracts	Other current liabilities	$	—	(36,102		)	$	—	$	(36,102	)

		As of December 31, 2017
(in thousands)	Balance Sheet Classification	Level 1		Level 2			Level 3		Total
Assets
Foreign currency exchange contracts	Other current assets	$	—	$	36,574		$	—	$	36,574
Liabilities
Foreign currency exchange contracts	Other current liabilities	$	—	$	(22,495	)	$	—	$	(22,495	)