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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]



	As of December 31, 2016
	Total				Quoted market prices in active markets (Level 1)				Significant other observable inputs (Level 2)				Significant unobservable inputs (Level 3)
	(In thousands)
Assets:
Cash equivalents: money-market funds	$	17,027			$	17,027			$	—			$	—
Available-for-sale securities: U.S. treasuries⁽¹⁾	123,838				123,838				—				—
Available-for-sale securities: certificates of deposit ⁽¹⁾	148				148				—				—
Trading securities: mutual funds⁽¹⁾	1,528				1,528				—				—
Foreign currency forward contracts⁽²⁾	8,763				—				8,763				—
Total assets measured at fair value	$	151,304			$	142,541			$	8,763			$	—
Liabilities:
Foreign currency forward contracts⁽³⁾	$	1,705			$	—			$	1,705			$	—
Total liabilities measured at fair value	$	1,705			$	—			$	1,705			$	—

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⁽¹⁾	Included in short-term investments on the Company's consolidated balance sheets.


⁽²⁾	Included in prepaid expenses and other current assets on the Company's consolidated balance sheets.


⁽³⁾	Included in other accrued liabilities on the Company's consolidated balance sheets.



	As of December 31, 2017
	Total				Quoted market prices in active markets (Level 1)				Significant other observable inputs (Level 2)				Significant unobservable inputs (Level 3)
	(In thousands)
Assets:
Cash equivalents: money-market funds	$	12,606			$	12,606			$	—			$	—
Available-for-sale securities: U.S. treasuries⁽¹⁾	124,670				124,670				—				—
Available-for-sale securities: certificates of deposit ⁽¹⁾	162				162				—				—
Trading securities: mutual funds⁽¹⁾	2,094				2,094				—				—
Foreign currency forward contracts⁽²⁾	1,799				—				1,799				—
Total assets measured at fair value	$	141,331			$	139,532			$	1,799			$	—
Liabilities:
Foreign currency forward contracts⁽³⁾	$	8,192			$	—			$	8,192			$	—
Total liabilities measured at fair value	$	8,192			$	—			$	8,192			$	—

_________________________


⁽¹⁾	Included in short-term investments on the Company's consolidated balance sheets.


⁽²⁾	Included in prepaid expenses and other current assets on the Company's consolidated balance sheets.


⁽³⁾	Included in other accrued liabilities on the Company's consolidated balance sheets.