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Per Share Data (Tables)
 6 Months Ended
Jun. 30, 2011
Per Share Data  
Calculation of Basic and Diluted Earnings Per Share
                                 
      Three Months Ended
June 30,		     Six Months Ended
June 30,		  

(in thousands, except per share amounts)

    2011     2010     2011     2010  

Earnings per share calculation - basic

                                 

Income (loss) from continuing operations attributable to common shareholders

    $ (16,597 )    $ 1,170      $ (9,311 )    $ 2,757   

Amount allocated to participating securities

      139        (32 )      36        (70 ) 
                                  

Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities

      (16,458 )      1,138        (9,275 )      2,687   

Income from discontinued operations attributable to common shareholders

      —          964        —          1,662   
                                  

Net income (loss) attributable to common shareholders, as adjusted

    $ (16,458 )    $ 2,102      $ (9,275 )    $ 4,349   
                                  

Income (loss) from continuing operations attributable to common shareholders, as adjusted – per share

    $ (0.23 )    $ 0.02      $ (0.13 )    $ 0.04   

Income from discontinued operations attributable to common shareholders – per share

      —          0.01        —          0.02   
                                  

Net income (loss) attributable to common shareholders, as adjusted – per share

    $ (0.23 )    $ 0.03      $ (0.13 )    $ 0.06   
                                  

Weighted average number of common shares outstanding - basic

      72,343        68,090        72,126        67,287   

Earnings per share calculation - diluted

                                 

Income (loss) from continuing operations attributable to common shareholders, net of amount allocated to participating securities

    $ (16,458 )    $ 1,138      $ (9,275 )    $ 2,687   

Income allocated to common units

      —          —          —          —     
                                  

Income (loss) from continuing operations attributable to common shareholders, as adjusted

      (16,458 )      1,138        (9,275 )      2,687   

Income from discontinued operations attributable to common shareholders

      —          964        —          1,662   
                                  

Net income (loss) attributable to common shareholders, as adjusted

    $ (16,458 )    $ 2,102      $ (9,275 )    $ 4,349   
                                  

Income (loss) from continuing operations attributable to common shareholders, as adjusted – per share

    $ (0.23 )    $ 0.02      $ (0.13 )    $ 0.04   

Income from discontinued operations attributable to common shareholders – per share

      —          0.01        —          0.02   
                                  

Net income (loss) attributable to common shareholders, as adjusted – per share

    $ (0.23 )    $ 0.03      $ (0.13 )    $ 0.06   
                                  

Weighted average number of common shares outstanding - basic

      72,343        68,090        72,126        67,287   

Incremental shares issuable from assumed conversion of:

                                 

Common share options and share awards granted

      —          296        —          234   

Common units

      —          —          —          —     
                                  

Weighted average number of common shares outstanding - diluted

      72,343        68,386        72,126        67,521