Income Taxes Narrative (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Income tax benefit		$ 9,342,000	$ 15,712,000	$ 226,000
Reversal of tax reserves	7,236,000	7,236,000
Unrecognized tax benefits	19,121,000	19,121,000	26,419,000	29,903,000	31,818,000
Unrecognized tax benefits that would impact effective tax rate if recognized	100,000	100,000
Reversal of valuation allowance, foreign taxes		7,298,000	0	0
Federal
Income Taxes [Line Items]
Operating Loss Carryforwards	146,400,000	146,400,000
Federal research and development credit carryforwards	30,300,000	30,300,000
Federal | Stock Option Deductions
Income Taxes [Line Items]
Operating Loss Carryforwards	10,400,000	10,400,000
Domestic
Income Taxes [Line Items]
Domestic state net operating loss carryforwards	164,400,000	164,400,000
Federal research and development credit carryforwards	$ 17,700,000	$ 17,700,000