Income Taxes (Deferred Tax Assets (Liabilities)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Net operating losses U.S.	$ 123,907	$ 122,731
Foreign net operating loss	6,405
Research tax credits	9,175	5,693
Other	6,844	7,326
Total deferred tax assets	146,331	135,750
Deferred Tax Assets Goodwill And Intangible Assets	(3,573)
Other	(227)	(335)
Total deferred tax liabilities	(3,800)	(335)
Net deferred tax assets	142,531	135,415
Less valuation allowance	(142,531)	(135,415)
Deferred tax assets, net