Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Schedule of assets measured at fair value on a recurring basis

The Company’s assets that are measured at fair value on a recurring basis, at September 30, 2013 and December 31, 2012, consist of the following:



			Fair Value Measurements at Reporting Date Using
At September 30, 2013	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)
Unrestricted
Available-for-sale marketable securities:
U.S. government and government agency obligations	$	106,789			$	106,789
Corporate bonds	303,194				303,194
Commercial paper	57,118				57,118
Municipal bonds	26,823				26,823
International government agency obligations	8,304				8,304
Certificates of deposit	7,505				7,505
Equity securities	2,242		$	2,242
	$	511,975	$	2,242	$	509,733

At December 31, 2012
Unrestricted
Available-for-sale marketable securities:
U.S. government and government agency obligations	$	328,146			$	328,146
Municipal bonds	17,510				17,510
Equity securities	3,393		$	3,393
	349,049		3,393		345,656
Restricted
Available-for-sale marketable securities:
U.S. government obligations	5,909				5,909
	$	354,958	$	3,393	$	351,565

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring and/or nonrecurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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