Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014 (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Assets:
Money market instruments	$	777	$	—
Corporate bonds	—		247,183
Treasury bills	—		90,412
Asset-backed securities	—		63,867
Euro liquidity fund	—		48,235
Agency bonds	—		16,449
Sovereign bonds	—		13,461
Municipal bonds	—		7,837
Supranational bonds	—		1,901
Cash flow hedge forward contracts	—		108
Economic hedge forward contracts	—		6
Liabilities:
Cash flow hedge forward contracts	—		84
Economic hedge forward contracts	—		13