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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Financial assets and liabilities measured at fair value on recurring basis
                                 
          Fair Value Measurements Using:  
                Significant Other     Significant  
          Quoted Prices in     Observable     Unobservable  
          Active Markets     Inputs     Inputs  

(in thousands)

   Fair Value     (Level 1)     (Level 2)     (Level 3)  

Assets:

                                

Investments—equity securities

   $ 2,594     $ 2,594     $ —       $ —    

Investments—other

   $ 2,097     $ 2,098     $ —       $ —    

Mark-to-market energy assets, including call option

   $ 585     $ —       $ 585     $ —    
         

Liabilities:

                                

Mark-to-market energy liabilities

   $ 504     $ —       $ 504     $ —    
                                 
          Fair Value Measurements Using:  
                Significant Other     Significant  
          Quoted Prices in     Observable     Unobservable  
          Active Markets     Inputs     Inputs  

(in thousands)

   Fair Value     (Level 1)     (Level 2)     (Level 3)  

Assets:

                                

Investments—equity securities

   $ 2,224     $ 2,224     $ —       $ —    

Investments—other (1)

   $ 1,734     $ 1,734     $ —       $ —    

Mark-to-market energy assets, including put option

   $ 1,754     $ —       $ 1,754     $ —    
         

Liabilities:

                                

Mark-to-market energy liabilities

   $ 1,496     $ —       $ 1,496     $ —    

 

(1) 

The current portion of this investment ($40) is included in other current assets in the accompanying consolidated balance sheets.