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Equity (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Equity Compensation Plans    
Equity-based compensation expense (in dollars) $ 3,130,000 $ 2,800,000
CIGS Solar Systems Abandonment
   
Equity Compensation Plans    
Equity-based compensation expense (in dollars)   300,000
Stock options
   
Equity Compensation Plans    
Unrecognized equity-based compensation costs (in dollars) 10,500,000  
Period over which unrecognized equity-based compensation costs will be recognized (in years) 1.7  
Restricted Stock and Restricted Stock Units
   
Equity Compensation Plans    
Unrecognized equity-based compensation costs (in dollars) $ 13,800,000  
Restricted Stock
   
Equity Compensation Plans    
Period over which unrecognized equity-based compensation costs will be recognized (in years) 2.9