Investments (Tables)

6 Months Ended

Jun. 30, 2011


			Unrealized
	Cost Basis		Gain (Loss)			Fair Value
As of June 30, 2011
Short-term investments:
Certificates of deposit	$	229,532	$	—		$	229,532
U.S. dollar indexed bond funds		33,530		(1,833	)		31,697

	$	263,062	$	(1,833	)	$	261,229

Long-term investments:
Assets held in a rabbi trust	$	7,920	$	480		$	8,400


As of December 31, 2010
Short-term investments:
Certificates of deposit	$	221,706	$	—		$	221,706
U.S. dollar indexed bond funds		52,714		(1,297	)		51,417

	$	274,420	$	(1,297	)	$	273,123

Long-term investments:
Assets held in a rabbi trust	$	8,068	$	95		$	8,163

- Definition

This item represents the entire disclosure related to Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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