Loss and Loss Adjustment Expenses (Tables)

12 Months Ended

Dec. 31, 2021

Insurance [Abstract]

Summary of Development Tables of Incurred and Paid Losses and Allocated Loss Adjustment Expenses Net of Reinsurance

	Incurred Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance																				As of
	For the Years Ended December 31,																				December 31, 2021
	(Dollars in thousands)																				Total IBNR
																					Plus
																					Expected		Cumulative
																					Development		Number of
Accident	Unaudited (1)																				on Reported		Claims
Year	2012		2013		2014		2015		2016		2017		2018		2019		2020		2021		Claims		Reported
2012	$	222,549	$	222,075	$	212,738	$	193,515	$	184,460	$	182,859	$	180,387	$	178,586	$	177,547	$	176,843	$	5,481		5,749
2013		—		241,810		241,811		233,656		220,457		214,701		210,588		209,184		207,304		205,421		7,031		5,768
2014		—		—		268,846		268,846		249,097		235,058		226,933		218,386		212,417		210,811		4,508		5,840
2015		—		—		—		262,573		262,573		252,514		235,471		220,965		211,758		207,929		4,397		5,516
2016		—		—		—		—		250,491		250,491		241,406		218,005		209,214		202,820		5,674		5,393
2017		—		—		—		—		—		244,094		244,098		234,587		220,096		211,964		4,910		5,212
2018		—		—		—		—		—		—		250,487		250,487		235,641		217,369		8,241		5,471
2019		—		—		—		—		—		—		—		241,344		241,344		227,246		10,308		5,213
2020		—		—		—		—		—		—		—		—		220,710		220,710		10,919		4,376
2021		—		—		—		—		—		—		—		—		—		222,715		14,125		4,080
																	Total		$	2,103,828	$	75,594

	Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
	For the Years Ended December 31,
	(Dollars in thousands)
Accident	Unaudited (1)																				Claim
Year	2012		2013		2014		2015		2016		2017		2018		2019		2020		2021		Frequency (2)
2012	$	50,579	$	107,467	$	133,658	$	149,161	$	154,553	$	157,207	$	159,807	$	161,014	$	162,588	$	164,337		18.73
2013		—		51,396		119,507		150,304		165,994		172,479		177,724		180,614		182,465		183,365		16.56
2014		—		—		53,060		119,820		153,320		169,736		180,683		186,129		191,394		192,168		14.99
2015		—		—		—		54,141		121,599		151,818		170,461		182,053		185,657		188,145		14.25
2016		—		—		—		—		52,238		115,713		143,016		156,861		166,887		172,133		14.23
2017		—		—		—		—		—		56,951		122,552		151,427		166,448		175,733		14.68
2018		—		—		—		—		—		—		62,061		126,057		152,328		172,423		15.21
2019		—		—		—		—		—		—		—		58,883		120,512		154,391		15.25
2020		—		—		—		—		—		—		—		—		50,113		109,882		13.91
2021		—		—		—		—		—		—		—		—		—		52,292		14.24
																	Total			1,564,869
All outstanding liabilities before 2012, net of reinsurance																				87,052
Liabilities for loss and loss adjustment expenses, net of reinsurance																				626,012
(1)     Data presented for these calendar years is required supplementary information, which is unaudited.
(2)     Frequency, as calculated above, refers to reported claims divided by gross premium earned.

Summary of Average Annual Percentage Payout of Incurred Losses by Age Net of Reinsurance for Worker's Compensation and General Liability

The average annual percentage payout of incurred losses by age, net of reinsurance, for workers’ compensation and general liability as of December 31, 2021 is summarized below. Since workers’ compensation has long payout periods, the table below shows less than 100% in the years disclosed.  This is required supplementary information, which is unaudited.

Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance (Unaudited)
Year 1	Year 2	Year 3	Year 4	Year 5	Year 6	Year 7	Year 8	Year 9	Year 10
25.8%	30.6%	14.3%	8.0%	4.4%	2.2%	1.6%	0.7%	0.7%	1.0%

Reconciliation of Beginning and Ending Reserve Balances, Net of Related Amounts Recoverable from Reinsurers

The following table provides a reconciliation of the beginning and ending reserve balances, net of related amounts recoverable from reinsurers, for 2021, 2020 and 2019:

	Year Ended December 31,
	2021			2020			2019
	(in thousands)
Balance, beginning of period	$	760,561		$	772,887		$	798,409
Less amounts recoverable from reinsurers    on unpaid loss and loss adjustment expenses		105,707			95,343			107,216
Net balance, beginning of period		654,854			677,544			691,193
Add incurred related to:
Current accident year		222,715			220,710			241,344
Prior accident years		(61,917	)		(63,484	)		(65,002	)
Total incurred		160,798			157,226			176,342
Less paid related to:
Current accident year		52,292			50,113			58,883
Prior accident years		137,348			129,803			131,108
Total paid		189,640			179,916			189,991
Net balance, end of period		626,012			654,854			677,544
Add amounts recoverable from reinsurers    on unpaid loss and loss adjustment expenses		119,266			105,707			95,343
Balance, end of period	$	745,278		$	760,561		$	772,887

Summary Exposures to Various Asbestos Related Claims

The following table details our exposures to various asbestos related claims:

	Year Ended December 31,
	2021			2020			2019
	(in thousands)
Reserves for loss and LAE at beginning of year	$	318		$	1,323		$	1,555
Incurred losses and LAE during the current year		(44	)		(936	)		(183	)
Loss and LAE payments		(14	)		(69	)		(49	)
Reserves for loss and LAE at end of year	$	260		$	318		$	1,323