Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of summary of company's segment results

Segment results are reported prior to the effects of the intercompany reinsurance agreements between the Company’s insurance subsidiaries. All gross written premiums and net earned premiums for all periods presented were generated from policies issued to U.S. based insureds.

	Excess and Surplus Lines		Specialty Admitted Insurance		Casualty Reinsurance			Corporate and Other		Total
	(in thousands)
As of and for the Year Ended December 31, 2019
Gross written premiums	$	922,320	$	387,642	$	160,773		$	—	$	1,470,735
Net earned premiums	625,528		54,338		143,880			—		823,746
Segment revenues	657,501		61,241		183,700			4,683		907,125
Net investment income	21,358		3,802		46,325			4,167		75,652
Interest expense	—		—		—			10,596		10,596
Underwriting profit (loss) of operating segments	19,157		5,913		(7,161		)	—		17,909
Segment goodwill	181,831		—		—			—		181,831
Segment assets	2,481,934		786,433		1,699,473			56,565		5,024,405

As of and for the Year Ended December 31, 2018
Gross written premiums	$	656,538	$	374,346	$	135,889	$	—	$	1,166,773
Net earned premiums	555,684		55,146		204,568		—		815,398
Segment revenues	580,785		56,717		243,178		4,919		885,599
Net investment income	14,456		3,262		38,838		4,700		61,256
Interest expense	—		—		—		11,553		11,553
Underwriting profit of operating segments	42,834		6,972		5,103		—		54,909
Segment goodwill	181,831		—		—		—		181,831
Segment assets	972,111		633,689		1,453,754		77,222		3,136,776

As of and for the Year Ended December 31, 2017
Gross written premiums	$	530,120	$	316,430	$	235,355		$	—	$	1,081,905
Net earned premiums	463,521		68,110		209,478			—		741,109
Segment revenues	493,853		70,366		240,751			12,655		817,625
Net investment income	15,014		2,532		31,507			12,066		61,119
Interest expense	—		—		—			8,974		8,974
Underwriting profit (loss) of operating segments	29,693		3,166		(1,765		)	—		31,094
Segment goodwill	181,831		—		—			—		181,831
Segment assets	843,486		439,416		1,379,866			93,927		2,756,695

Schedule of underwriting profit (loss) of operating segments by individual segment and reconciliation to consolidated income before taxes

The following table reconciles the underwriting profit (loss) of operating segments by individual segment to income before taxes:

	Year Ended December 31,
	2019			2018			2017
	(in thousands)
Underwriting profit (loss) of the operating segments:
Excess and Surplus Lines	$	19,157		$	42,834		$	29,693
Specialty Admitted Insurance	5,913			6,972			3,166
Casualty Reinsurance	(7,161		)	5,103			(1,765		)
Total underwriting profit of operating segments	17,909			54,909			31,094
Other operating expenses of the Corporate and Other segment	(27,664		)	(26,903		)	(25,330		)
Underwriting (loss) profit	(9,755		)	28,006			5,764
Net investment income	75,652			61,256			61,119
Net realized and unrealized losses on investments	(2,919		)	(5,479		)	(1,989		)
Other income	1,137			505			361
Other expenses	(1,055		)	(1,300		)	(539		)
Interest expense	(10,596		)	(11,553		)	(8,974		)
Amortization of intangible assets	(597		)	(597		)	(597		)
Income before income taxes	$	51,867		$	70,838		$	55,145

Schedule of gross written premiums by segment and underwriting division

Gross written premiums by segment and underwriting division are presented below:

	Year Ended December 31,
	2019		2018		2017
	(in thousands)
Commercial Auto	$	405,565	$	322,126	$	247,960
Excess Casualty	118,954		66,452		51,160
General Casualty	115,832		54,127		38,097
Manufacturers and Contractors	105,096		79,160		85,719
Energy	45,442		33,942		29,704
Excess Property	31,606		16,963		14,447
Allied Health	26,713		30,450		19,181
Life Sciences	24,462		16,636		12,981
Small Business	19,725		14,808		11,307
Environmental	16,539		10,499		7,920
Professional Liability	6,441		5,916		6,326
Sports and Entertainment	4,212		3,685		3,021
Medical Professionals	1,733		1,774		2,297
Total Excess and Surplus Lines segment	922,320		656,538		530,120
Specialty Admitted Insurance segment	387,642		374,346		316,430
Casualty Reinsurance segment	160,773		135,889		235,355
Total	$	1,470,735	$	1,166,773	$	1,081,905