Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments [Abstract]

Schedule Of Investments

Investments were as follows as of December 31, 2016 and 2015:  

				Gross		Gross
				Unrealized		Unrealized			Fair		Carrying
Description	Designation	Cost		Gains		Losses			Value		Value
		(in thousands)
December 31, 2016
Nuclear decommissioning trust (1)
Debt securities	Available for sale	$	44,086	$	3,537	$	—		$	47,623	$	47,623
Equity securities	Available for sale		75,332		35,958		(277	)		111,013		111,013
Cash and other	Available for sale		519		—		—			519		519
Total Nuclear Decommissioning Trust		$	119,937	$	39,495	$	(277	)	$	159,155	$	159,155
Lease Deposits (2)
Government obligations	Held to maturity	$	104,514	$	2,948	$	—		$	107,462	$	104,514
Total Lease Deposits		$	104,514	$	2,948	$	—		$	107,462	$	104,514
Unrestricted investments
Government obligations	Held to maturity	$	2,000	$	1	$	—		$	2,001	$	2,000
Debt securities	Held to maturity		2,210		6		—			2,216		2,210
Total Unrestricted Investments		$	4,210	$	7	$	—		$	4,217	$	4,210
Other
Equity securities	Trading	$	198	$	49	$	—		$	247	$	247
Non-marketable equity investments	Equity		2,142		2,012		—			4,154		2,142
Total Other		$	2,340	$	2,061	$	—		$	4,401	$	2,389
											$	270,268
December 31, 2015
Nuclear decommissioning trust (1)
Debt securities	Available for sale	$	42,898	$	2,940	$	—		$	45,838	$	45,838
Equity securities	Available for sale		72,213		29,164		(1,713	)		99,664		99,664
Cash and other	Available for sale		213		—		—			213		213
Total Nuclear Decommissioning Trust		$	115,324	$	32,104	$	(1,713	)	$	145,715	$	145,715
Lease Deposits (2)
Government obligations	Held to maturity	$	101,816	$	4,428	$	—		$	106,244	$	101,816
Total Lease Deposits		$	101,816	$	4,428	$	—		$	106,244	$	101,816
Unrestricted investments
Government obligations	Held to maturity	$	2,003	$	—	$	(2	)	$	2,001	$	2,003
Debt securities	Held to maturity		2,689		—		(5	)		2,684		2,689
Total Unrestricted Investments		$	4,692	$	—	$	(7	)	$	4,685	$	4,692
Other
Equity securities	Trading	$	175	$	36	$	—		$	211	$	211
Non-marketable equity investments	Equity		2,190		1,978		—			4,168		2,190
Total Other		$	2,365	$	2,014	$	—		$	4,379	$	2,401
											$	254,624

⁽¹⁾ Investments in the nuclear decommissioning trust are restricted for the use of funding our share of the asset retirement obligations of the future decommissioning of North Anna.  See Note 3—Accounting for Asset Retirement and Environmental Obligations.  Unrealized gains and losses related to assets held in the nuclear decommissioning trust are deferred as a regulatory asset or liability, respectively.

⁽²⁾ Investments in lease deposits are restricted for the use of funding our future lease obligations.  See Note 8—Long-term Lease Transaction.

Our investments by classification as of December 31, 2016 and 2015, were as follows:  

	December 31, 2016				December 31, 2015
			Carrying				Carrying
Description	Cost		Value		Cost		Value
	(in thousands)				(in thousands)
Available for sale	$	119,937	$	159,155	$	115,324	$	145,715
Held to maturity		108,724		108,724		106,508		106,508
Equity		2,142		2,142		2,190		2,190
Trading		198		247		175		211
Total	$	231,001	$	270,268	$	224,197	$	254,624

Schedule Of Contractual Maturities Of Debt Securities

Contractual maturities of debt securities as of December 31, 2016, were as follows:  

	Less than						More than
Description	1 year		1-5 years		5-10 years		10 years		Total
	(in thousands)
Available for sale (1)	$	—	$	—	$	47,623	$	—	$	47,623
Held to maturity		3,294		105,430		—		—		108,724
Total	$	3,294	$	105,430	$	47,623	$	—	$	156,347