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Debt (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Apr. 16, 2007
Debt              
Loss on extinguishment of debt related to the unamortized debt discount $ 3,045,000     $ 3,349,000      
Components of interest expense recorded on the notes              
Accretion of the discount on the Notes       1,260,000 1,501,000    
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   $ 50.59     $ 27.23
Premium over the closing market price of common stock on April 16, 2007 (as a percent) 38.00%     38.00%      
Principal of notes tendered for conversion 98,100,000 7,500,000   98,100,000      
Notes tendered, cash paid 98,100,000 7,500,000          
Notes tendered, shares issued upon conversion (in shares) 1,660,095 111,318          
Loss on extinguishment of debt related to the unamortized debt discount 3,000,000 300,000          
Components of interest expense recorded on the notes              
Contractual interest 1,013,000   1,089,000 2,025,000 2,178,000    
Accretion of the discount on the Notes 490,000   760,000 1,260,000 1,501,000    
Total interest expense on the Notes 1,503,000   1,849,000 3,285,000 3,679,000    
Effective interest rate 6.10%   7.00% 6.70% 7.00%    
Carrying amount of the liability and equity components of the notes              
Carrying amount of the equity component           16,318,000  
Principal balance of the liability component           105,574,000  
Less: unamortized discount           4,436,000  
Net carrying value of the liability component           101,138,000  
Mortgage Payable
             
Carrying amount of the liability and equity components of the notes              
Principal balance of the liability component 2,800,000     2,800,000      
Fair value of debt instrument $ 3,000,000     $ 3,000,000      
Annual interest rate accrued on mortgage (as a percent) 7.91%     7.91%