Debt: (Tables)

12 Months Ended

Dec. 31, 2015

Debt:

Schedule of principal amount of long-term debt and the associated unamortized debt issuance costs and debt discounts

	2015				2014
		Principal		Unamortized Debt Issuance Costs and Debt Discounts		Principal		Unamortized Debt Issuance Costs and Debt Discounts
		(dollars in thousands)
FFB	$	3,777,540	$	56,851	$	3,456,953	$	58,417
FMBs		2,809,093		32,002		2,810,103		33,782
PCBs		980,770		9,135		980,770		9,740
CFC		4,238		–		5,085		–
CoBank		3,386		–		4,084		–
	$	7,575,027	$	97,988	$	7,256,995	$	101,939

Long Term Debt And Capital Lease Obligations

Debt

Schedule of maturities for long-term debt and capital lease obligations

			(dollars in thousands)
			2016		2017		2018		2019		2020
FFB		$	145,846	$	143,110	$	148,210	$	153,233	$	156,998
FMBs			1,010		1,010		1,010		351,010		1,010
PCBs(1)			37,352		37,352		37,352		–		181,075
CFC			891		937		984		1,035		391
CoBank			786		885		996		719		–
			185,885		183,294		188,552		505,997		339,474
Capital Leases			3,955		4,404		4,905		5,462		6,082
Total		$	189,840	$	187,698	$	193,457	$	511,459	$	345,556
(1)	In addition to regularly scheduled principal payments on the bonds, this includes amounts that would be due if the credit support facilities for the Series 2009 and Series 2010 pollution control bonds were drawn upon and became payable in accordance with their terms, such as would occur if the credit facility providing the support was not renewed or extended at its expiration date. These amounts equal $37 million in each of the years 2016, 2017 and 2018 and $134 million in 2020. We anticipate extending these credit facilities before their expiration. The nominal maturities of the Series 2009 and Series 2010 pollution control bonds range from 2030 through 2038.