Business Segments (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

	Revenues
(In thousands)	Earned Premiums (1)		Investment Income		Other		Total (2)		Pre-Tax Income (Loss)		Net Income (Loss) to Common Stockholders
Three months ended June 30, 2020
Insurance	$	1,465,044	$	44,105	$	8,018	$	1,517,167	$	76,546	$	48,607
Reinsurance & Monoline Excess	211,871		23,461		—		235,332		12,566		10,689
Corporate, other and eliminations (3)	—		17,865		87,777		105,642		(61,548)		(47,823)
Net investment gains	—		—		77,885		77,885		77,885		59,787
Total	$	1,676,915	$	85,431	$	173,680	$	1,936,026	$	105,449	$	71,260
Three months ended June 30, 2019
Insurance	$	1,475,184	$	132,403	$	13,687	$	1,621,274	$	225,871	$	179,241
Reinsurance & Monoline Excess	171,657		44,449		—		216,106		52,635		41,864
Corporate, other and eliminations (3)	—		11,481		100,949		112,430		(78,344)		(62,519)
Net investment gains	—		—		73,574		73,574		73,574		58,123
Total	$	1,646,841	$	188,333	$	188,210	$	2,023,384	$	273,736	$	216,709
Six months ended June 30, 2020
Insurance	$	2,949,999	$	167,564	$	16,490	$	3,134,053	$	252,493	$	185,467
Reinsurance & Monoline Excess	418,334		61,171		—		479,505		49,080		39,877
Corporate, other and eliminations (3)	—		31,459		200,907		232,366		(103,302)		(81,689)
Net investment losses	—		—		(99,289)		(99,289)		(99,289)		(76,813)
Total	$	3,368,333	$	260,194	$	118,108	$	3,746,635	$	98,982	$	66,842
Six Months Ended June 30, 2019
Insurance	$	2,902,218	$	232,444	$	26,931	$	3,161,593	$	410,387	$	325,234
Reinsurance & Monoline Excess	337,479		84,023		—		421,502		97,490		77,389
Corporate, other and eliminations (3)	—		30,120		204,965		235,085		(146,928)		(117,551)
Net investment gains	—		—		142,226		142,226		142,226		112,359
Total	$	3,239,697	$	346,587	$	374,122	$	3,960,406	$	503,175	$	397,431

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(1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions.

(2) Revenues for Insurance from foreign countries for the three months ended June 30, 2020 and 2019 were $149 million and $179 million, respectively, and for the six months ended June 30, 2020 and 2019 were $317 million and $349 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign countries for the three months ended June 30, 2020 and 2019 were $65 million and $62 million, respectively, and for the six months ended June 30, 2020 and 2019 were $134 million and $121 million, respectively.

(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments

Identifiable Assets By Segment

(In thousands)	June 30, 2020		December 31, 2019
Insurance	$	20,422,642	$	20,005,802
Reinsurance & Monoline Excess	4,559,313		4,710,819
Corporate, other and eliminations	2,341,337		1,913,409
Consolidated	$	27,323,292	$	26,630,030

Net Premiums Earned By Major Line Of Business

Net premiums earned by major line of business are as follows:

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
(In thousands)	2020		2019		2020		2019
Insurance:
Other liability	$	544,465	$	505,621	$	1,091,594	$	996,282
Short-tail lines (1)	295,968		305,852		591,446		594,943
Workers' compensation	278,699		330,510		580,299		657,186
Commercial automobile	190,335		188,278		379,978		369,203
Professional liability	155,577		144,923		306,682		284,604
Total Insurance	1,465,044		1,475,184		2,949,999		2,902,218
Reinsurance & Monoline Excess:
Casualty reinsurance	130,459		95,109		253,190		185,939
Monoline excess (2)	41,062		39,400		83,224		78,381
Property reinsurance	40,350		37,148		81,920		73,159
Total Reinsurance & Monoline Excess	211,871		171,657		418,334		337,479
Total	$	1,676,915	$	1,646,841	$	3,368,333	$	3,239,697

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(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.

(2) Monoline excess includes operations that solely retain risk on an excess basis.