Fair Value (Tables)

6 Months Ended

Jun. 30, 2017

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)	June 30, 2017		(Level 1)		(Level 2)		(Level 3)
Assets:
Fixed maturities, market value
U.S. Treasury securities and obligations of
U.S. government agencies and corporations	$	666,777	$	-	$	666,777	$	-
Obligations of U.S. States and political subdivisions		696,783		-		696,783		-
Corporate securities		2,301,001		-		2,214,861		86,140
Asset-backed securities		189,989		-		189,989		-
Mortgage-backed securities
Commercial		73,245		-		73,245		-
Agency residential		683,681		-		683,681		-
Non-agency residential		70		-		70		-
Foreign government securities		501,387		-		501,387		-
Foreign corporate securities		1,027,095		-		1,023,944		3,151
Total fixed maturities, market value		6,140,028		-		6,050,737		89,291
Equity securities, fair value		934,110		893,660		40,450		-
Other invested assets, fair value		1,724,532		-		-		1,724,532

			Fair Value Measurement Using:
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
(Dollars in thousands)	December 31, 2016		(Level 1)		(Level 2)		(Level 3)
Assets:
Fixed maturities, market value
U.S. Treasury securities and obligations of
U.S. government agencies and corporations	$	691,080	$	-	$	691,080	$	-
Obligations of U.S. States and political subdivisions		729,984		-		729,984		-
Corporate securities		2,154,203		-		2,089,006		65,197
Asset-backed securities		137,027		-		137,027		-
Mortgage-backed securities
Commercial		75,493		-		75,493		-
Agency residential		715,144		-		715,144		-
Non-agency residential		88		-		88		-
Foreign government securities		507,277		-		507,277		-
Foreign corporate securities		960,200		-		957,662		2,538
Total fixed maturities, market value		5,970,496		-		5,902,761		67,735
Equity securities, fair value		887,800		827,237		60,563		-
Other invested assets, fair value		1,766,626		-		-		1,766,626

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

Three Months Ended June 30, 2017							Six Months Ended June 30, 2017
	Corporate		Foreign					Corporate		Foreign
(Dollars in thousands)	Securities		Corporate		Total			Securities		Corporate		Total
Beginning balance	$	84,322	$	2,802	$	87,124		$	65,197	$	2,538	$	67,735
Total gains or (losses) (realized/unrealized)
Included in earnings		711		128		839			925		104		1,029
Included in other comprehensive income (loss)		172		-		172			143		-		143
Purchases, issuances and settlements		935		221		1,156			19,875		509		20,384
Transfers in and/or (out) of Level 3		-		-		-			-		-		-
Ending balance	$	86,140	$	3,151	$	89,291		$	86,140	$	3,151	$	89,291
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.)

	Three Months Ended June 30, 2016								Six Months Ended June 30, 2016
	Corporate			Foreign					Corporate			Foreign
(Dollars in thousands)	Securities			Corporate		Total			Securities			Corporate			Total
Beginning balance	$	15,706		$	596	$	16,302		$	3,933		$	1,593		$	5,526
Total gains or (losses) (realized/unrealized)
Included in earnings		(18	)		-		(18	)		(10	)		(997	)		(1,007	)
Included in other comprehensive income (loss)		(27	)		1,425		1,398			(33	)		1,425			1,392
Purchases, issuances and settlements		16,749			-		16,749			28,520			-			28,520
Transfers in and/or (out) of Level 3		-			-		-			-			-			-
Ending balance	$	32,410		$	2,021	$	34,431		$	32,410		$	2,021		$	34,431
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	$	-		$	-	$	-		$	-		$	(997	)	$	(997	)

Fair Value Measurements Using Significant Unobservable Inputs for Equity Index Put Option Contracts

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(Dollars in thousands)	2017			2016			2017			2016
Other invested assets, fair value:
Beginning balance	$	1,837,302		$	1,773,214		$	1,766,626		$	1,773,214
Total gains or (losses) (realized/unrealized)
Included in earnings		(112,769	)		(756	)		(42,094	)		(756	)
Included in other comprehensive income (loss)		-			-			-			-
Purchases, issuances and settlements		-			-			-			-
Transfers in and/or (out) of Level 3		-			-			-			-
Ending balance		1,724,532		$	1,772,458		$	1,724,532		$	1,772,458
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.)