SEGMENT INFORMATION (TABLES)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

UNDERWRITING RESULTS OF REPORTABLE SEGMENTS

The following tables summarize the underwriting results of our reportable segments, as well as the carrying values of allocated goodwill and intangible assets:

At and year ended December 31, 2016	Insurance			Reinsurance			Total
Gross premiums written	$	2,720,242		$	2,249,966		$	4,970,208
Net premiums written	1,807,125			1,945,849			3,752,974
Net premiums earned	1,777,321			1,928,304			3,705,625
Other insurance related income	89			7,133			7,222
Net losses and loss expenses	(1,141,933		)	(1,062,264		)	(2,204,197		)
Acquisition costs	(251,120		)	(495,756		)	(746,876		)
General and administrative expenses	(346,857		)	(135,844		)	(482,701		)
Underwriting income	$	37,500		$	241,573		279,073
Corporate expenses							(120,016		)
Net investment income							353,335
Net realized investment losses							(60,525		)
Foreign exchange gains							121,295
Interest expense and financing costs							(51,360		)
Income before income taxes and interest in income (loss) of equity method investments							$	521,802
Net loss and loss expense ratio	64.3		%	55.1		%	59.5		%
Acquisition cost ratio	14.1		%	25.7		%	20.2		%
General and administrative expense ratio	19.5		%	7.0		%	16.2		%
Combined ratio	97.9		%	87.8		%	95.9		%
Goodwill and intangible assets	$	85,049		$	—		$	85,049

At and year ended December 31, 2015	Insurance			Reinsurance			Total
Gross premiums written	$	2,583,081		$	2,020,649		$	4,603,730
Net premiums written	1,759,359			1,915,307			3,674,666
Net premiums earned	1,798,191			1,888,226			3,686,417
Other insurance related income (loss)	1,036			(3,989		)	(2,953		)
Net losses and loss expenses	(1,154,928		)	(1,021,271		)	(2,176,199		)
Acquisition costs	(261,208		)	(456,904		)	(718,112		)
General and administrative expenses	(341,658		)	(145,253		)	(486,911		)
Underwriting income	$	41,433		$	260,809		302,242
Corporate expenses							(109,910		)
Net investment income							305,336
Net realized investment loss							(138,491		)
Foreign exchange gains							102,312
Interest expense and financing costs							(50,963		)
Termination fee received							280,000
Reorganization and related expenses							(45,867		)
Income before income taxes and interest in income (loss) of equity method investments							$	644,659
Net loss and loss expense ratio	64.2		%	54.1		%	59.0		%
Acquisition cost ratio	14.5		%	24.2		%	19.5		%
General and administrative expense ratio	19.1		%	7.7		%	16.2		%
Combined ratio	97.8		%	86.0		%	94.7		%
Goodwill and intangible assets	$	86,858		$	—		$	86,858

At and year ended December 31, 2014	Insurance			Reinsurance			Total
Gross premiums written	$	2,535,415		$	2,176,104		$	4,711,519
Net premiums written	1,779,501			2,127,474			3,906,975
Net premiums earned	1,830,544			2,040,455			3,870,999
Other insurance related income (loss)	(11		)	661			650
Net losses and loss expenses	(1,131,880		)	(1,054,842		)	(2,186,722		)
Acquisition costs	(278,804		)	(458,393		)	(737,197		)
General and administrative expenses	(341,214		)	(144,987		)	(486,201		)
Underwriting income	$	78,635		$	382,894		461,529
Corporate expenses							(135,675		)
Net investment income							342,766
Net realized investment gains							132,108
Foreign exchange gains							104,439
Interest expense and financing costs							(74,695		)
Income before income taxes and interest in income (loss) of equity method investments							$	830,472
Net loss and loss expense ratio	61.8		%	51.7		%	56.5		%
Acquisition cost ratio	15.2		%	22.5		%	19.0		%
General and administrative expense ratio	18.7		%	7.1		%	16.1		%
Combined ratio	95.7		%	81.3		%	91.6		%
Goodwill and intangible assets	$	88,960		$	—		$	88,960

GROSS PREMIUMS WRITTEN BY GEOGRAPHICAL LOCATION OF SUBSIDIARIES

The following table presents our gross premiums written by the geographical location of our subsidiaries:

Year ended December 31,	2016		2015		2014
Bermuda	$	465,980	$	525,226	$	618,273
Ireland	1,650,229		1,532,753		1,641,767
U.S.	2,562,789		2,364,099		2,309,107
Other	291,210		181,652		142,372
Total gross premium written	$	4,970,208	$	4,603,730	$	4,711,519

NET PREMIUMS EARNED BY SEGMENT AND LINE OF BUSINESS

The following table presents our net premiums earned by segment and line of business:    

Year ended December 31,	2016		2015		2014
Insurance
Property	$	426,918	$	432,587	$	444,197
Marine	150,046		183,696		178,229
Terrorism	33,279		36,818		35,876
Aviation	44,980		45,659		41,192
Credit and Political Risk	57,964		63,583		63,095
Professional Lines	510,806		596,430		629,365
Liability	169,182		161,614		146,819
Accident and Health	384,146		277,804		291,771
Total Insurance	1,777,321		1,798,191		1,830,544
Reinsurance
Catastrophe	199,825		216,020		325,307
Property	272,403		306,083		312,443
Professional Lines	289,868		310,915		336,058
Credit and Surety	252,210		250,208		263,013
Motor	318,863		299,883		268,678
Liability	332,479		297,000		289,223
Agriculture	142,501		129,346		164,628
Engineering	62,833		61,043		61,143
Marine and Other	57,322		17,728		19,962
Total Reinsurance	1,928,304		1,888,226		2,040,455
Total	$	3,705,625	$	3,686,417	$	3,870,999