Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

Net cash receipts (payments) included in cash from operating activities related to settlements associated with foreign currency forward contracts for the three and six months ended June 30, 2017 and 2018 are as follows:

	Three Months Ended June 30,					Six Months Ended June 30,
	2017		2018			2017		2018
Net cash receipts (payments)	$	893	$	(7,554	)	$	893	$	(1,211	)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Our policy is to record the fair value of each derivative instrument on a gross basis. The following table provides the fair value of our derivative instruments not designated as hedging instruments as of December 31, 2017 and June 30, 2018:

Derivatives Not Designated as Hedging Instruments	Balance Sheet Location	December 31, 2017		June 30, 2018
Derivative assets	Prepaid expenses and other	$	1,579	$	318
Derivative liabilities	Accrued expenses	2,329		3,413

Derivative Instruments, Gain (Loss) [Table Text Block]

(Gains) losses for our derivative instruments not recognized as hedging instruments for the three and six months ended June 30, 2017 and 2018 are as follows:

		Three Months Ended June 30,				Six Months Ended June 30,
Derivatives Not Designated as Hedging Instruments	Location of Loss (Gain) Recognized in Income on Derivative	2017		2018		2017		2018
Foreign exchange contracts	Other (income) expense, net	$	—	$	9,547	$	—	$	3,556

Foreign exchange gains related to currency translation adjustments

As a result, we recorded the following foreign exchange (losses) gains related to the change in fair value of such debt due to currency translation adjustments, which is a component of accumulated other comprehensive items, net:

	Three Months Ended June 30,					Six Months Ended June 30,
	2017			2018		2017			2018
Foreign exchange (losses) gains	$	(7,076	)	$	10,257	$	(8,148	)	$	4,622