Fair Value (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair value of financial assets and liabilities

The fair value of financial assets and liabilities was determined using the following levels of inputs as of September 30, 2017 and December 31, 2016:

	Fair Value Measurements as of September 30, 2017
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets
Cash equivalents:
Money market funds	$	489,487	$	489,487	$	—	$	—
Short-term investments:
Marketable equity securities	4,135		4,135		—		—
Trading securities held in Non-Qualified Deferred Compensation, or NQDC, trust	29,498		29,498		—		—
Total Assets	$	523,120	$	523,120	$	—	$	—
	Total		Level 1		Level 2		Level 3
	(In thousands)
Liabilities
Foreign currency exchange contracts	$	1,971	$	—	$	1,971	$	—
	Fair Value Measurements as of December 31, 2016
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets
Cash equivalents:
Money market funds	$	237,724	$	237,724	$	—	$	—
Short-term investments:
Marketable equity securities	3,057		3,057		—		—
Trading securities held in NQDC trust	26,622		26,622		—		—
Total Assets	$	267,403	$	267,403	$	—	$	—
	Total		Level 1		Level 2		Level 3
	(In thousands)
Liabilities
Foreign currency exchange contracts	$	2,653	$	—	$	2,653	$	—