Cash and Investments in Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Cash and Investments in Marketable Securities, Including Cash Equivalents and Restricted Cash

Cash and investments in marketable securities, including cash equivalents and restricted cash, are as follows (in thousands):

	Estimated Fair Value at
	September 30, 2014		December 31, 2013
Cash and cash equivalents	$	32,008	$	39,067
Short-term investments		204,635		197,959
Restricted cash		25,000		25,000
Total cash and investments in marketable securities	$	261,643	$	262,026

Portfolio of Cash and Investments in Marketable Securities

Our portfolio of cash and investments in marketable securities includes (in thousands):

		Estimated Fair Value at
	Fair Value Hierarchy Level	September 30, 2014		December 31, 2013
Corporate notes and bonds	2	$	177,168	$	138,515
Corporate commercial paper	2		27,467		59,444
Available-for-sale investments			204,635		197,959
Money market funds	1		28,216		26,453
Cash, including restricted cash	N/A		28,792		37,614
Total cash and investments in marketable securities		$	261,643	$	262,026