Business Segments (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

Summary financial information about the Company's reporting segments is presented in the following tables. Income (loss) before income taxes by segment includes allocated investment income. Identifiable assets by segment are those assets used in or allocated to the operation of each segment.

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total (1)		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Three months ended September 30, 2017
Insurance	$	1,433,729	$	105,924	$	—	$	1,539,653	$	171,478		$	123,240
Reinsurance	147,771		21,528		—		169,299		(57,643		)	(35,074		)
Corporate, other and eliminations (2)	—		15,027		123,404		138,431		(71,681		)	(45,685		)
Net investment gains	—		—		183,959		183,959		183,959			119,573
Total	$	1,581,500	$	142,479	$	307,363	$	2,031,342	$	226,113		$	162,054
Three months ended September 30, 2016
Insurance	$	1,423,635	$	111,300	$	—	$	1,534,935	$	210,498		$	140,730
Reinsurance	162,309		27,567		—		189,876		27,321			18,725
Corporate, other and eliminations (2)	—		6,801		112,377		119,178		(81,942		)	(53,035		)
Net investment gains	—		—		175,738		175,738		175,738			114,230
Total	$	1,585,944	$	145,668	$	288,115	$	2,019,727	$	331,615		$	220,650
Nine months ended September 30, 2017:
Insurance	$	4,262,485	320,552		$	—	$	4,583,037	$	557,605		$	381,736
Reinsurance	457,759		67,798		—		525,557		(38,279		)	(20,801		)
Corporate, other and eliminations (2)	—		38,251		326,203		364,454		(224,716		)	(146,324		)
Net investment gains	—		—		276,760		276,760		276,760			179,894
Total	$	4,720,244	$	426,601	$	602,963	$	5,749,808	$	571,370		$	394,505
Nine months ended September 30, 2016:
Insurance	$	4,180,985	$	304,904	$	—	$	4,485,889	$	586,651		$	394,746
Reinsurance	492,087		77,119		—		569,206		79,215			54,885
Corporate, other and eliminations (2)	—		22,827		415,224		438,051		(190,655		)	(123,610		)
Net investment gains	—		—		189,394		189,394		189,394			123,106
Total	$	4,673,072	$	404,850	$	604,618	$	5,682,540	$	664,605		$	449,127

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(1) Revenues for Insurance from foreign countries for the three months ended September 30, 2017 and 2016 were $166 million and $187 million, respectively, and for the nine months ended September 30, 2017 and 2016 were $513 million and $546 million, respectively. Revenues for Reinsurance from foreign countries for the three months ended September 30, 2017 and 2016 were $49 million and $48 million, respectively, and for the nine months ended September 30, 2017 and 2016 were $150 million and $153 million, respectively.

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

Identifiable Assets By Segment

Identifiable Assets

(In thousands)	September 30, 2017		December 31, 2016
Insurance	$	19,136,776	$	19,137,758
Reinsurance	3,243,610		2,524,338
Corporate, other and eliminations	1,955,690		1,687,980
Consolidated	$	24,336,076	$	23,350,076

Net Premiums Earned By Major Line Of Business

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

	For the Three Months				For the Nine Months
	Ended September 30,				Ended September 30,
(In thousands)	2017		2016		2017		2016
Insurance:
Other liability	$	466,616	$	455,841	$	1,378,505	$	1,302,841
Workers’ compensation	378,529		354,185		1,106,616		1,042,503
Short-tail lines (1)	287,860		312,865		887,791		962,435
Commercial automobile	163,277		164,540		482,929		481,249
Professional liability	137,447		136,204		406,644		391,957
Total Insurance	1,433,729		1,423,635		4,262,485		4,180,985
Reinsurance:
Casualty	94,478		97,153		282,430		301,571
Property	53,293		65,156		175,329		190,516
Total Reinsurance	147,771		162,309		457,759		492,087
Total	$	1,581,500	$	1,585,944	$	4,720,244	$	4,673,072

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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.