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Debt (Details 2) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Jun. 30, 2011
Convertible Notes
Mar. 31, 2011
Convertible Notes
Debt        
Principal of notes tendered for conversion       $ 7,500,000
Conversion price of convertible notes (in dollars per share)     $ 50.59 $ 45.95
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 $ 3,045,000 $ 3,349,000 $ 3,000,000 $ 300,000