Capital leases: (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 are as follows:

Year Ending December 31,		(dollars in thousands)
		Scherer Unit No. 2
2016	$	14,949
2017		14,949
2018		14,949
2019		14,949
2020		14,949
2021-2031		115,331
Total minimum lease payments		190,076
Less: Amount representing interest		(89,620	)
Present value of net minimum lease payments		100,456
Less: Current portion		(3,955	)
Long-term balance	$	96,501