Investments in Debt and Equity Securities

9 Months Ended

Sep. 30, 2018

Investments in Debt and Equity Securities

Investments in Debt and Equity Securities

(D) Investments in Debt and Equity Securities.  Investment securities we hold are carried at market value. Prior to October 1, 2017, unrealized gains and losses of investment securities related to nuclear decommissioning were deferred pursuant to regulated operations accounting, while those of all other investment securities were recorded to accumulated other comprehensive (deficit) margin. During the fourth quarter of 2017, we began applying regulated operations accounting to the unrealized gains and losses of all investment securities. All realized and unrealized gains and losses are determined using the specific identification method. As of September 30, 2018, approximately 55% of these gross unrealized losses with a fair value totaling $47,209,000 million had been unrealized for a duration of greater than one year, while the remaining gross unrealized losses with a fair value of $209,318,000 had been unrealized for a duration of less than one year.

The following tables summarize debt and equity securities as of September 30, 2018 and December 31, 2017.

	Gross Unrealized
	(dollars in thousands)
							Fair
September 30, 2018	Cost		Gains		Losses		Value
Equity	$	249,762	$	111,570	$	(4,682)	$	356,650
Debt		274,110		573		(6,073)		268,610
Other		1,520		—		—		1,520
Total	$	525,392	$	112,143	$	(10,755)	$	626,780

	Gross Unrealized
	(dollars in thousands)
							Fair
December 31, 2017	Cost		Gains		Losses		Value
Equity	$	246,549	$	91,954	$	(4,064)	$	334,439
Debt		240,878		1,814		(2,262)		240,430
Other		10,807		1		—		10,808
Total	$	498,234	$	93,769	$	(6,326)	$	585,677