Investments Securities

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities.    Investment securities we hold are recorded at fair value in the accompanying consolidated balance sheets. We apply 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.

The following tables summarize debt and equity securities as of March 31, 2022 and December 31, 2021.

	Gross Unrealized
	(dollars in thousands)
March 31, 2022	Cost		Gains		Losses		Fair Value
Equity	$	310,055	$	236,875	$	(4,239)	$	542,691
Debt	792,554		446		(24,757)		768,243
Other	7,134		—		—		7,134
Total	$	1,109,743	$	237,321	$	(28,996)	$	1,318,068

	Gross Unrealized
	(dollars in thousands)
December 31, 2021	Cost		Gains		Losses		Fair Value
Equity	$	304,305	$	280,127	$	(4,682)	$	579,750
Debt	774,580		4,859		(7,001)		772,438
Other	19,102		—		(1)		19,101
Total	$	1,097,987	$	284,986	$	(11,684)	$	1,371,289