Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Financial assets subject to fair value measurements (excluding restricted cash and cash equivalents (VIE))

The following table sets forth the Company’s financial assets (excluding VIE cash and cash equivalents) subject to fair value measurements:

	Fair Value Measurements as of December 31, 2016
				Fair Value Hierarchy
	Total			Level 1		Level 2			Level 3
	(in thousands)
Financial instruments carried at fair value (asset position):
Cash equivalents:
Money market funds	$	280,560		$	280,560	$	—		$	—
Marketable securities:
Government-sponsored enterprise securities	15,508			15,508		—			—
Corporate equity securities	64,560			64,560		—			—
Commercial paper	59,404			—		59,404			—
Corporate debt securities	111,140			—		111,140			—
Prepaid and other current assets:
Foreign currency forward contracts	14,407			—		14,407			—
Other assets:
Foreign currency forward contracts	1,186			$	—	1,186			$	—
Total financial assets	$	546,765		$	360,628	$	186,137		$	—
Financial instruments carried at fair value (liability position):
Other liabilities, current portion:
Foreign currency forward contracts	$	(144	)	$	—	$	(144	)	$	—
Total financial liabilities	$	(144	)	$	—	$	(144	)	$	—

	Fair Value Measurements as of December 31, 2015
				Fair Value Hierarchy
	Total			Level 1		Level 2			Level 3
	(in thousands)
Financial instruments carried at fair value (asset position):
Cash equivalents:
Money market funds	$	199,507		$	199,507	$	—		$	—
Government-sponsored enterprise securities	85,994			85,994		—			—
Commercial paper	34,889			—		34,889			—
Corporate debt securities	11,533			—		11,533			—
Marketable securities:
Government-sponsored enterprise securities	87,162			87,162		—			—
Commercial paper	99,123			—		99,123			—
Corporate debt securities	141,409			—		141,409			—
Prepaid and other current assets:
Foreign currency forward contracts	5,161			—		5,161			—
Other assets:
Foreign currency forward contracts	605			$	—	605			$	—
Total financial assets	$	665,383		$	372,663	$	292,720		$	—
Financial instruments carried at fair value (liability position):
Other liabilities, current portion:
Foreign currency forward contracts	$	(769	)	$	—	$	(769	)	$	—
Other liabilities, excluding current portion:
Foreign currency forward contracts	(132		)	—		(132		)	—
Total financial liabilities	$	(901	)	$	—	$	(901	)	$	—