Available-for-Sale Securities and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Available-for-Sale Securities and Fair Value Measurements.

Schedule of available-for-sale securities

	Fair Value
	Hierarchy	Estimated Fair Value
(In thousands)	Level	September 30, 2016		December 31, 2015
U.S. government securities	Level 1	$	42,125	$	47,043
U.S. government agency securities	Level 2	73,957		31,465
Corporate notes	Level 2	58,971		19,089
Commercial paper	Level 2	27,626		4,990

Marketable securities		202,679		102,587
Money market funds	Level 1	67,841		69,126

Total		$	270,520	$	171,713

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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