XML 18 R25.htm IDEA: XBRL DOCUMENT

Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2012

Marketable Securities

Cash equivalents and marketable securities classified as available-for-sale

		March 31, 2012
(Dollars in thousands)		Fair Value			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Weighted Rate of Return
Money market funds		$	172,588		$	172,588		$	—		$	—		0.01	%
Corporate notes, bonds and commercial paper		43,970			43,976			1			(7		)	0.13	%
Total cash equivalents and marketable securities		216,558			216,564			1			(7		)
Cash		15,960			15,960			—			—
Total cash, cash equivalents and marketable securities		$	232,518		$	232,524		$	1		$	(7	)

		As of December 31, 2011
								Gross			Gross			Weighted
					Amortized			Unrealized			Unrealized			Rate of
(Dollars in thousands)		Fair Value			Cost			Gains			Losses			Return
Money market funds		$	127,559		$	127,559		$	—		$	—		0.01	%
Corporate notes, bonds and commercial paper		137,108			137,208			—			(100		)	0.29	%
Total cash equivalents and marketable securities		264,667			264,767			—			(100		)
Cash		24,789			24,789			—			—
Total cash, cash equivalents and marketable securities		$	289,456		$	289,556		$	—		$	(100	)

Available-for-sale securities reported at fair value

		March 31, 2012			December 31, 2011
		(Dollars in thousands)
Cash equivalents		$	172,588		$	137,455
Short term marketable securities		43,970			127,212
Total cash equivalents and marketable securities		216,558			264,667
Cash		15,960			24,789
Total cash, cash equivalents and marketable securities		$	232,518		$	289,456

Estimated fair value of cash equivalents and marketable securities classified by date of contractual maturity and the length of time that the securities have been in a continuous unrealized loss ,net , position

		As of						Unrealized Loss, net
		March 31,			December 31,			March 31,			December 31,
		2012			2011			2012			2011
		(In thousands)
Less than one year		$	216,558		$	264,667		$	(6	)	$	(100	)