XML 101 R74.htm IDEA: XBRL DOCUMENT v2.4.0.8
Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax [Line Items]        
Income tax receivables $ 400,000 $ 8,400,000    
Valuation Allowance [Abstract]        
Valuation allowance 128,865,000 90,799,000    
Change in valuation allowance 38,100,000 8,800,000    
Increase from current deferred tax assets 30,600,000      
Increase due to valuation allowance 7,500,000      
Alternative minimum tax credit carryforward 3,561,000 3,698,000    
Research and development tax credit carryforwards 23,079,000 22,101,000    
Income Tax Uncertainties [Abstract]        
Unrecognized tax benefits 4,505,000 3,978,000 16,721,000 14,033,000
Unrecognized tax benefits that would impact effective tax rate 400,000 400,000    
Decrease in unrecognized tax benefits 900,000      
Income Tax Examination [Abstract]        
Accrued interest and penalties related to uncertain tax positions 100,000 100,000    
Internal Revenue Service (IRS)
       
Valuation Allowance [Abstract]        
Operating loss carryforwards $ 118,900,000 $ 47,400,000