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Summary of Significant Policies (Tables)
6 Months Ended
Jun. 30, 2011
Summary of Significant Policies (Tables) [Abstract]  
Summary of changes in reserve for future abandonment costs
                 
    Six Months Ended  
    June 30,  
    2011     2010  
    (In thousands)  
Beginning future abandonment costs
  $ 6,674     $ 6,561  
Accretion expense
    186       191  
New wells placed on production and changes in estimates
    191       131  
Liabilities settled
    (42 )     (43 )
 
           
Future abandonment costs — end of period
  $ 7,009     $ 6,840  
 
           
Income tax expense
                                 
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
    2011     2010     2011     2010  
            (In thousands)          
Current provision (benefit)
  $ 410     $ (33 )   $ 569     $ 183  
Deferred provision (benefit)
    2,172       12       2,621       (43 )
 
                       
Provision for (benefit from) income taxes
  $ 2,582     $ (21 )   $ 3,190     $ 140  
 
                       
Difference between customary rate and effective tax rate on income before income taxes due
                                 
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2011   2010   2011   2010
Tax at statutory rate
    35.0 %     35.0 %     35.0 %     35.0 %
Tax effect of:
                               
Nondeductible stock-based compensation
    4.3 %     (35.7 %)     (2.0 %)     (24.2 %)
State income taxes, net of federal benefit
    (0.1 %)     (0.5 %)     0.2 %     (1.2 %)
Net operating loss carryback adjustments
    %     %     %     (6.3 %)
Domestic production activities deduction
    %     3.2 %     %     0.3 %
Other
    0.3 %     (0.7 %)     0.2 %     (1.2 %)
 
                               
Effective tax rate
    39.5 %     1.3 %     33.4 %     2.4 %
 
                               
Summary of financial assets and liabilities at fair value
         
    Carrying  
    Value  
    Measured at  
    Fair Value  
    (In thousands)  
Items measured at fair value on a recurring basis:
       
Cash equivalents — money market funds
  $ 3,556  
Marketable securities
    62,482  
 
     
Total assets
  $ 66,038  
 
     
Carrying amounts and estimated fair value of other financial instruments
                                 
    As of June 30, 2011   As of December 31, 2010
    Carrying   Fair   Carrying   Fair
    Value   Value   Value   Value
            (In thousands)        
Long-term debt, including current portion
  $ 691,640     $ 705,500     $ 513,372     $ 518,930  
Basic and diluted earnings per share
                                                 
    Three Months Ended June 30,  
    2011     2010  
                    Per     Income             Per  
    Income     Shares     Share     (Loss)     Shares     Share  
            (In thousands, except per share amounts)          
Net Income (Loss)
  $ 3,949                     $ (1,619 )                
Income Allocable to Unvested Stock Grants
    (136 )                                      
 
                                           
Basic Net Income (Loss) Attributable to Common Stock
  $ 3,813       45,992     $ 0.08     $ (1,619 )     45,579     $ (0.04 )
 
                                           
Effect of Dilutive Securities:
                                               
Stock Options
                                       
 
                                       
Diluted Net Income (Loss) Attributable to Common Stock
  $ 3,813       45,992     $ 0.08     $ (1,619 )     45,579     $ (0.04 )
 
                                   
                                                 
    Six Months Ended June 30,  
    2011     2010  
                    Per                     Per  
    Income     Shares     Share     Income     Shares     Share  
            (In thousands, except per share amounts)          
Net Income
  $ 6,353                     $ 5,723                  
Income Allocable to Unvested Stock Grants
    (224 )                     (206 )                
 
                                           
Basic Net Income Attributable to Common Stock
  $ 6,129       45,983     $ 0.13     $ 5,517       45,494     $ 0.12  
 
                                           
Effect of Dilutive Securities:
                                               
Stock Options
                              77          
 
                                       
Diluted Net Income Attributable to Common Stock
  $ 6,129       45,983     $ 0.13     $ 5,517       45,571     $ 0.12  
 
                                   
Weighted average shares of unvested restricted stock
                                 
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2011   2010   2011   2010
            (In thousands)        
Unvested restricted stock
    1,644       1,698       1,680       1,698  
Common Stock stock options excluded as anti-dilutive from determination of diluted earnings per share
                                 
    Three Months Ended   Six Months Ended
    June 30,   June 30,
    2011   2010   2011   2010
    (In thousands except per share data)
Weighted average anti-dilutive stock options
    216       270       226       40  
Weighted average exercise price
  $ 36.39     $ 36.38     $ 36.22     $ 54.36  
Cash payments made for interest and income taxes
                 
    Six Months Ended June 30,
    2011   2010
    (In thousands)
Cash Payments:
               
Interest payments
  $ 20,564     $ 20,284  
Income tax payments (refunds)
  $ 19     $ (48,843 )
Comprehensive income (loss)
                                 
    Three Months Ended June 30,     Six Months Ended June 30,  
    2011     2010     2011     2010  
            (In thousands)          
Net income (loss)
  $ 3,949     $ (1,619 )   $ 6,353     $ 5,723  
Other comprehensive income (loss):
                               
Realized gain on marketable securities reclassified to earnings, net of income tax expense of $2,968, $1,992, $10,405 and $1,992
    (5,512 )     (3,700 )     (19,324 )     (3,700 )
Unrealized gain (loss) on marketable securities, net of income tax expense (benefit) of ($2,307), ($10,630), $8,252, and ($11,188)
    (4,285 )     (19,742 )     15,325       (20,778 )
 
                       
Total comprehensive income (loss)
  $ (5,848 )   $ (25,061 )   $ 2,354     $ (18,755 )
 
                       
Accumulated other comprehensive income related to changes in the fair value of marketable securities
                 
    Three Months     Six Months  
    Ended     Ended  
    June 30, 2011     June 30, 2011  
    (In thousands)  
Balance as of beginning of the period
  $ 38,128     $ 32,330  
Realized gain on sale of marketable securities, net of income taxes, reclassified to earnings
    (5,512 )     (19,324 )
Changes in the value of marketable securities, net of income taxes
    (4,285 )     15,325  
 
           
Balance as of June 30, 2011
  $ 28,331     $ 28,331