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Capital leases: (Tables)
 12 Months Ended
Dec. 31, 2012
Capital leases:  
Schedule of minimum lease payments under capital leases together with present value of net minimum lease payments

The minimum lease payments under the capital leases together with the present value of the net minimum lease payments as of December 31, 2012 are as follows:

   

Year Ending December 31,

     (dollars in thousands)  
   

 

     Scherer Unit No. 2     Doyle     Total  
   

2013

   $ 23,406   $ 12,447   $ 35,853  

2014

     14,949     12,447     27,396  

2015

     14,949     18,297     33,246  

2016

     14,949     –        14,949  

2017

     14,949     –        14,949  

2018-2031

     160,178     –        160,178  
   

Total minimum lease payments

    
243,380		    
43,191		    
286,571		  

Less: Amount representing interest

    
(121,258
)		  
(4,064
)		  
(125,322
)
   

Present value of net minimum lease payments

    
122,122		    
39,127		    
161,249		  

Less: Current portion

    
(14,924
)		  
(10,382
)		  
(25,306
)
   

Long-term balance

  
$
107,198		  
$
28,745		  
$
135,943