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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2013
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

5. Property, Plant and Equipment

 

     Useful lives    December 31,  
     in years    2013      2012  
          (In Thousands)  

Machinery, equipment and automotive

    3 - 30    $ 319,088       $ 253,317   

Proved natural gas properties

    *      66,764         49,801   

Buildings and improvements

    8 - 30      48,379         44,248   

Furniture, fixtures and store equipment

    3 - 10      6,933         6,718   

Assets under capital leases

    10      1,672         1,468   

Land improvements

    10 - 40      6,214         1,148   

Construction in progress

    N/A      110,376         52,673   

Capital spare parts

    N/A      9,718         5,430   

Land

    N/A      9,780         10,386   
     

 

 

     

 

 

  
        578,924         425,189   

Less accumulated depreciation, depletion and amortization

      162,123         143,318   
     

 

 

     

 

 

  
      $ 416,801       $ 281,871   
     

 

 

     

 

 

  

Machinery, equipment and automotive primarily includes the categories of property and equipment and estimated useful lives as follows: chemical processing plants and plant infrastructure (15-30 years); production, fabrication, and assembly equipment (7-15 years); certain processing plant components (3-10 years); and trucks, automobiles, trailers, and other rolling stock (3-7 years). At December 31, 2013 and 2012, assets capitalized under capital leases consist of machinery and equipment. Accumulated amortization for assets capitalized under capital leases were $714,000 and $567,000 at December 31, 2013 and 2012, respectively. During 2013 and 2012, interest cost capitalized in PP&E was $3,986,000 and $398,000, respectively.

 

* See information concerning natural gas properties included in PP&E in Note 1- Summary of Significant Accounting Policies.