Industry Segments (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Financial Information Of Company Operating Segments

	Revenues
(In thousands)	Earned Premiums		Investment Income		Other		Total		Pre-Tax Income (Loss)			Net Income (Loss) to Common Stockholders
Three months ended March 31, 2016:
Insurance	$	1,375,358	$	105,229	$	26,793	$	1,507,380	$	205,915		$	139,270
Reinsurance	151,977		18,401		—		170,378		21,797			15,117
Corporate, other and eliminations (1)	—		6,503		115,607		122,110		(60,379		)	(39,649		)
Net investment gains	—		—		7,343		7,343		7,343			4,773
Consolidated	$	1,527,335	$	130,133	$	149,743	$	1,807,211	$	174,676		$	119,511
Three months ended March 31, 2015:
Insurance	$	1,311,276	$	99,084	$	25,575	$	1,435,935	$	188,169		$	130,039
Reinsurance	160,737		17,041		—		177,778		20,262			14,500
Corporate, other and eliminations (1)	—		8,114		103,808		111,922		(58,758		)	(38,611		)
Net investment gains	—		—		19,044		19,044		19,044			12,379
Consolidated	$	1,472,013	$	124,239	$	148,427	$	1,744,679	$	168,717		$	118,307
Twelve months ended December 31, 2015:
Insurance	$	5,431,500	$	410,457	$	96,487	$	5,938,444	$	776,593		$	532,286
Reinsurance	609,109		74,226		—		683,335		94,852			66,627
Corporate, other and eliminations (1)	—		27,962		464,392		492,354		(231,739		)	(155,230		)
Net investment gains	—		—		92,324		92,324		92,324			60,011
Consolidated	$	6,040,609	$	512,645	$	653,203	$	7,206,457	$	732,030		$	503,694
Twelve months ended December 31, 2014
Insurance	$	5,074,308	$	484,039	$	106,853	$	5,665,200	$	826,088		$	561,643
Reinsurance	670,110		88,821		—		758,931		115,677			79,720
Corporate, other and eliminations (1)	—		28,025		421,920		449,945		(244,421		)	(158,133		)
Net investment gains	—		—		254,852		254,852		254,852			165,654
Consolidated	$	5,744,418	$	600,885	$	783,625	$	7,128,928	$	952,196		$	648,884
Twelve months ended December 31, 2013
Insurance	$	4,505,567	$	451,319	$	107,517	$	5,064,403	$	705,662		$	490,273
Reinsurance	720,970		89,090		—		810,060		110,425			78,013
Corporate, other and eliminations (1)	—		3,882		408,645		412,527		(238,743		)	(142,479		)
Net investment gains	—		—		121,544		121,544		121,544			74,118
Consolidated	$	5,226,537	$	544,291	$	637,706	$	6,408,534	$	698,888		$	499,925

________

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

Identifiable Assets By Segment

Identifiable Assets

(In thousands)	March 31, 2016		December 31, 2015		December 31, 2014
Insurance	$	18,232,365	$	18,063,730	$	17,944,847
Reinsurance	2,595,231		2,441,340		2,713,554
Corporate, other and eliminations	1,403,338		1,219,086		1,058,290
Consolidated	$	22,230,934	$	21,724,156	$	21,716,691

Net Premiums Earned By Major Line Of Business

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

	For the Three Months
	Ended March 31,
(In thousands)	2016		2015
Insurance:
Other liability	$	422,956	$	396,904
Workers’ compensation	345,503		314,738
Short-tail lines	331,857		323,090
Commercial automobile	156,817		165,560
Professional liability	118,225		110,984
Total Insurance	1,375,358		1,311,276
Reinsurance:
Casualty	100,334		112,816
Property	51,643		47,921
Total Reinsurance	151,977		160,737
Total	$	1,527,335	$	1,472,013