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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2012
Earnings Per Share [Abstract]  
Calculation Of Basic And Diluted Earnings Per Share
    Three Months Ended  
    March 31,  
(in thousands, except per share data)   2012     2011  
             
Net income   $ 5,598     $ 14,513  
                 
Denominator for basic earnings per share - weighted-average number of common shares outstanding during the period     57,484       60,919  
Incremental common shares attributable to exercise of outstanding dilutive options     212       444  
Incremental common shares attributable to outstanding restricted shares, restricted stock units and phantom stock     157       119  
Denominator for diluted earnings per share     57,853       61,482  
Basic earnings per share   $ 0.10     $ 0.24  
Diluted earnings per share   $ 0.10     $ 0.24