Fair Value (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value [Abstract]

Fair Value Measurement Levels For All Assets, Recorded At Fair And Market Value

			Fair Value Measurement Using:
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
(Dollars in thousands)	March 31, 2021		(Level 1)		(Level 2)		(Level 3)
Assets:
Fixed maturities, market value
U.S. Treasury securities and obligations of U.S. government agencies and corporations	$	638,843	$	-	$	638,843	$	-
Obligations of U.S. States and political subdivisions		595,048		-		595,048		-
Corporate securities		3,729,429		-		3,095,536		633,893
Asset-backed securities		2,490,103		-		1,704,743		785,360
Mortgage-backed securities
Commercial		572,590		-		572,590		-
Agency residential		1,005,851		-		1,005,851		-
Non-agency residential		6,264		-		6,264		-
Foreign government securities		769,289		-		769,289		-
Foreign corporate securities		1,242,584		-		1,236,986		5,598
Total fixed maturities, market value		11,050,001		-		9,625,150		1,424,851
Equity securities, fair value		1,226,120		1,191,064		35,056		-
Other invested assets, fair value		1,889,558		-		-		1,889,558

			Fair Value Measurement Using:
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
(Dollars in thousands)	December 31, 2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Fixed maturities, market value
U.S. Treasury securities and obligations of U.S. government agencies and corporations	$	681,989	$	-	$	681,989	$	-
Obligations of U.S. States and political subdivisions		577,046		-		577,046		-
Corporate securities		3,449,912		-		2,819,068		630,844
Asset-backed securities		2,474,170		-		1,851,137		623,033
Mortgage-backed securities
Commercial		550,080		-		550,080		-
Agency residential		965,100		-		965,100		-
Non-agency residential		3,164		-		3,164		-
Foreign government securities		742,238		-		742,238		-
Foreign corporate securities		1,199,866		-		1,194,167		5,699
Total fixed maturities, market value		10,643,565		-		9,383,989		1,259,576
Equity securities, fair value		1,288,767		1,222,158		66,609		-
Other invested assets, fair value		1,796,479		-		-		1,796,479

Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type

	Total Fixed Maturities, Market Value
	Three Months Ended March 31, 2021
	Corporate		Asset		Foreign
(Dollars in thousands)	Securities		Backed Securities		Corporate		Total
Beginning balance	$	630,843	$	623,033	$	5,700	$	1,259,576
Total gains or (losses) (realized/unrealized)
Included in earnings		(1,788)		(4,168)		2		(5,954)
Included in other comprehensive  income (loss)		2,835		(3,135)		49		(251)
Purchases, issuances and settlements		2,003		169,630		(153)		171,480
Transfers in and/or (out) of Level 3		-		-		-		-
Ending balance	$	633,893	$	785,360	$	5,598	$	1,424,851
The amount of total gains or losses for the  period included in earnings (or changes in  net assets) attributable to the change in  unrealized gains or losses relating to  assets still held at the reporting date	$	-	$	-	$	-	$	-
(Some amounts may not reconcile due to rounding.)

	Total Fixed Maturities, Market Value
	Three Months Ended March 31, 2020
	Corporate		Asset		Foreign
(Dollars in thousands)	Securities		Backed Securities		Corporate		Total
Beginning balance	$	546,939	$	153,641	$	1,751	$	702,331
Total gains or (losses) (realized/unrealized)
Included in earnings		(214)		4		-		(210)
Included in other comprehensive income (loss)		(3,357)		(15,882)		-		(19,239)
Purchases, issuances and settlements		99,064		100,868		(1,751)		198,181
Transfers in and/or (out) of Level 3		-		-		-		-
Ending balance	$	642,432	$	238,631	$	-	$	881,063
The amount of total gains or losses for the  period included in earnings (or changes in  net assets) attributable to the change in  unrealized gains or losses relating to  assets still held at the reporting date	$	(539)	$	-	$	-	$	(539)
(Some amounts may not reconcile due to rounding.)

	Total Fixed Maturities, Fair Value
	Three Months Ended March 31, 2021
	Foreign
(Dollars in thousands)	Corporate		Total
Beginning balance fixed maturities at fair value	$	-	$	-
Total gains or (losses) (realized/unrealized)
Included in earnings		-		-
Included in other comprehensive income (loss)		-		-
Purchases, issuances and settlements		-		-
Transfers in and/or (out) of Level 3		-		-
Ending balance	$	-	$	-
The amount of total gains or losses for the period  included in earnings (or changes in net assets)  attributable to the change in unrealized gains or  losses relating to assets still held at the  reporting date	$	-	$	-
(Some amounts may not reconcile due to rounding.)

	Total Fixed Maturities, Fair Value
	Three Months Ended March 31, 2020
	Foreign
(Dollars in thousands)	Corporate		Total
Beginning balance fixed maturities at fair value	$	5,826	$	5,826
Total gains or (losses) (realized/unrealized)
Included in earnings		(1,123)		(1,123)
Included in other comprehensive income (loss)		-		-
Purchases, issuances and settlements		-		-
Transfers in and/or (out) of Level 3		-		-
Ending balance	$	4,703	$	4,703
The amount of total gains or losses for the period  included in earnings (or changes in net assets)  attributable to the change in unrealized gains or  losses relating to assets still held at the  reporting date	$	-	$	-
(Some amounts may not reconcile due to rounding.)

Fair Value Measurements Using Significant Unobservable Inputs For Equity Securities and Other Invested Assets

	Three Months Ended
	March 31,
(Dollars in thousands)	2021		2020
Other invested assets, fair value:
Beginning balance	$	1,796,479	$	1,982,582
Total gains or (losses) (realized/unrealized)
Included in earnings		93,079		442,479
Included in other comprehensive income (loss)		-		-
Purchases, issuances and settlements		-		-
Transfers in and/or (out) of Level 3		-		-
Ending balance	$	1,889,558	$	2,425,061
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$	-	$	-
(Some amounts may not reconcile due to rounding.)