Cash and Investments in Marketable Securities (Tables)

12 Months Ended

Dec. 31, 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
	December 31, 2014		December 31, 2013
Cash and cash equivalents	$	12,365	$	39,067
Short-term investments		225,459		197,959
Restricted cash		25,000		25,000
Total cash and investments in marketable securities	$	262,824	$	262,026

Portfolio of Cash and Investments in Marketable Securities

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

	Fair  Value Hierarchy Level		Estimated Fair Value at
			December 31, 2014		December 31, 2013
Corporate notes and bonds		2	$	182,544	$	138,515
Corporate commercial paper		2		42,915		59,444
Available-for-sale investments				225,459		197,959
Money market funds		1		11,229		26,453
Cash, including restricted cash		N/A		26,136		37,614
Total cash and investments in marketable securities			$	262,824	$	262,026