Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property and Equipment [Abstract]

Property, Plant and Equipment

	Estimated Useful Lives		As of December 31,
	In Years		2013			2012
			(in thousands)
Computers and software	3-5		$	11,180		$	11,042
Furniture and fixtures	5-7		7,315			7,343
Laboratory equipment	3-7		34,952			36,065
Leasehold improvements	7-10		8,092			9,991
Buildings	15-40		59,104			58,945
Land		—	2,664			2,664
Total property and equipment			123,307			126,050
Less: Accumulated depreciation and amortization			(81,945		)	(83,416		)
Net property and equipment			$	41,362		$	42,634