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Earnings Per share (Details Textual)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share (Textual) [Abstract]        
Anti-dilutive shares excluded from calculation 311 1,761 311 1,761
5.75% convertible notes due 2013 [Member]
       
Earnings Per Share (Textual) [Abstract]        
Percentage of Convertible Notes, Anti-dilutive 5.75%   5.75%  
6.25% Convertible Notes due 2016 [Member]
       
Earnings Per Share (Textual) [Abstract]        
Percentage of Convertible Notes, Anti-dilutive   6.25%   6.25%