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Debt (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2011
Numerator
Denominator
Dec. 31, 2010
Dec. 31, 2009
Apr. 16, 2007
Debt            
Conversion price of convertible notes (in dollars per share)         $ 27.23  
Loss on extinguishment of debt     $ 3,349,000      
Components of interest expense recorded on the notes            
Accretion of the discount on the Notes     1,260,000 3,058,000 2,846,000  
Carrying amount of the liability and equity components of the notes            
Net carrying value of the liability component     2,654,000      
Convertible Notes
            
Debt            
Original conversion rate, number of shares to be issued per $1000 of principal amount of notes (in shares)     36.7277      
Convertible debt principal amount, basis for exchange     1,000      
Conversion price of convertible notes (in dollars per share) $ 50.59 $ 45.95       $ 27.23
Premium over the closing market price of common stock on April 16, 2007 (as a percent)     38.00%      
Principal of notes tendered for conversion 98,100,000 7,500,000        
Notes tendered, cash paid 98,100,000 7,500,000        
Notes tendered, shares issued upon conversion 1,660,095 111,318        
Loss on extinguishment of debt 3,000,000 300,000        
Components of interest expense recorded on the notes            
Contractual interest     2,025,000 4,355,000 4,356,000  
Accretion of the discount on the Notes     1,260,000 3,058,000 2,846,000  
Total interest expense on the Notes     3,285,000 7,413,000 7,202,000  
Effective interest rate (as a percent)     6.70% 7.00% 6.80%  
Carrying amount of the liability and equity components of the notes            
Carrying amount of the equity component     0 16,318,000    
Principal balance of the liability component     0 105,574,000    
Less: unamortized discount     0 4,436,000    
Net carrying value of the liability component     0 101,138,000    
Mortgage Payable
            
Carrying amount of the liability and equity components of the notes            
Principal balance of the liability component     $ 2,700,000 $ 2,900,000