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General Information (Tables)
 6 Months Ended
Jun. 30, 2011
General Information [Abstract]  
Earnings Per Share
                                 
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2011   2010   2011   2010
    (In thousands)   (In thousands)
         
Income (loss):
                               
Net income (loss) attributable to common stockholders
  $ 13,291     $ (90,731 )   $ 12,124     $ (69,188 )
Undistributed income allocated to participating securities
    (121 )     —       (141 )     —  
                         
Basic
    13,170       (90,731 )     11,983       (69,188 )
                         
Undistributed income allocated to participating securities
    121       —       141       —  
Undistributed income reallocated to participating securities
    (120 )     —       (140 )     —  
                         
Diluted
  $ 13,171     $ (90,731 )   $ 11,984     $ (69,188 )
                         
Shares:
                               
Basic
                               
Weighted-average common shares outstanding
    25,829       25,546       25,754       25,470  
Dilutive effect of stock options and restricted stock awards
    120       —       131       —  
                         
Diluted
    25,949       25,546       25,885       25,470  
                         
Income (loss) per common share:
                               
Basic
  $ 0.51     $ (3.55 )   $ 0.47     $ (2.72 )
Diluted
  $ 0.51     $ (3.55 )   $ 0.46     $ (2.72 )