Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31 (in thousands):

	Balance as of 2014		Quoted Prices  in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	737,024	$	482,686	$	254,338	$	—
Marketable securities	91,140		33,815		57,325		—
Derivatives	32,244		—		32,244		—
Total	$	860,408	$	516,501	$	343,907	$	—
Liabilities:
Derivatives	$	2,027	$	—	$	2,027	$	—

	Balance as of 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	836,387	$	516,173	$	320,214	$	—
Marketable securities	129,181		30,172		99,009		—
Derivatives	1,932		—		1,932		—
Total	$	967,500	$	546,345	$	421,155	$	—
Liabilities:
Derivatives	$	3,925	$	—	$	3,925	$	—