Annual report pursuant to Section 13 and 15(d)

Equity-Based Compensation (Details Textual)

v2.4.0.6
Equity-Based Compensation (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Plan
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity based compensation expense $ 5,100,000 $ 7,000,000 $ 6,500,000  
Equity-Based Compensation (Textual) [Abstract]        
Number of equity-based incentive compensation plans 3      
Vesting period 5 years     5 years
Excess tax benefits 0 0 0  
Unrecognized compensation cost 9,600,000      
Weighted-average period 2 years 10 months 24 days      
Common stock shares reserved for issuance 6,630,600      
Intrinsic value of stock options exercised 2,400,000 800,000 300,000  
Weighted average grant date fair value of stock options granted $ 2.44 $ 2.49 $ 1.39  
Fair value of stock options vested 3,400,000 6,400,000 3,400,000  
Restricted common stock shares issued       30,000
Expected volatility for options based on historical volatility 5 years or less      
Expected volatility for options based on a peer group 6 years and over      
2007 Equity Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 7 years     7 years
2000 Equity Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 10 years      
1996 Equity Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period 10 years      
Segment, Continuing Operations [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity based compensation expense 5,100,000 7,000,000 6,500,000  
Segment, Discontinued Operations [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity based compensation expense   200,000 400,000  
Selling, General and Administrative Expenses [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity based compensation expense 3,100,000 3,000,000 4,800,000  
Research and Development Expense [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Equity based compensation expense $ 2,000,000 $ 4,000,000 $ 1,700,000