Quarterly report pursuant to Section 13 or 15(d)

Earnings/(Loss) Per Share Details Textual (Details)

v2.4.0.6
Earnings/(Loss) Per Share Details Textual (Details) (1.875% convertible senior notes due 2032 [Member], USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
1.875% convertible senior notes due 2032 [Member]
   
Debt Instrument [Line Items]    
Aggregate principal amount of offering $ 126,500,000 $ 126,500,000
Debt instrument, interest rate, stated percentage 1.875% 1.875%
Debt instrument, convertible, conversion ratio 17.1985  
Conversion principal amount   $ 1,000