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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information [Abstract]  
Schedule Of Quarterly Financial Information
     
Quarter Ended
  
     
March 31,
      
June 30,
      
September 30,
      
December 31,
  
                                 
2011
                                
Net revenues
 
$
291,607
    
$
338,319
    
$
372,496
    
$
396,185
  
Gross profit (1) 
    
77,076
      
100,198
      
122,295
      
31,023
  
Net income (2) 
    
25,867
      
41,323
      
46,026
      
16,763
  
Net income applicable to common shareholders
    
25,857
      
41,313
      
46,016
      
16,753
  
Basic earnings per common share
   
0.24
      
0.39
      
0.43
      
0.16
  
Diluted earnings per common share
   
0.24
      
0.39
      
0.43
      
0.16
  
                                 
     
Quarter Ended
  
     
March 31,
      
June 30,
      
September 30,
      
December 31,
  
                                 
            2010
                                
Net revenues
 
$
201,570
    
$
299,262
    
$
392,669
    
$
306,337
  
Gross profit (loss) (3) 
    
25,856
      
(94,818
)
    
86,552
      
16,082
  
Net income (loss) (4) 
    
(17,831
)
    
(85,517
)
    
26,171
      
(49,811
)
Net income (loss) applicable to common shareholders
    
(17,891
)
    
(85,551
 
)
    
 
26,161
      
(49,821
)
Basic earnings (loss) per common share
   
(0.17
)
    
(0.82
)
    
0.25
      
(0.48
)
Diluted earnings (loss) per common share
   
(0.17
)
    
(0.82
)
    
0.25
      
(0.48
)
 
(1)  
Includes oil and gas property impairment charges totaling $22.7 million in the second quarter of 2011 and $2.4 million in the third quarter of 2011. Our fourth quarter of 2011 includes a total of $107.5 million of impairment charges, including $79.3 million related to eight oil and gas properties to reduce them to their estimated fair value at December 31, 2011 and $28.2 million to increase certain non-producing properties estimated asset retirement obligations, including $15.9 million related to our one U.K. oil and gas property (Note 5).  The fourth quarter also includes a $6.6 million impairment charge to reduce our Australian well intervention equipment to is estimated fair value at December 31, 2011.  There were no asset impairment charges in the first quarter of 2011.
(2)  
Our fourth quarter 2011 includes a $10.6 million other than temporary impairment loss on our equity investment in our Australian joint venture (Note 7).   The fourth quarter also includes a $31.3 million tax benefit related to reorganization of our Australian well intervention business.
(3)  
Includes oil and gas property impairment charges totaled $11.1 in the first quarter of 2010, $159.9 million in the second quarter of 2010, $0.9 million in the third quarter of 2010 and $9.2 million in the fourth quarter of 2010.
(4)  
Includes an impairment charges of $16.7 million to reduce goodwill associated with our Australia well intervention business in the fourth quarter of 2010 (Note 2).