Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following tables provide a summary of the segment results:

Year Ended December 31, 2013	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	1,163,146		$	641,764		$	933,754		$	2,738,664
Net premiums written	869,403			358,040			893,038			2,120,481
Net premiums earned	802,590			346,397			856,846			2,005,833
Net losses and loss expenses	(579,873		)	(121,789		)	(421,580		)	(1,123,242		)
Acquisition costs	(106,704		)	1,784			(147,753		)	(252,673		)
General and administrative expenses	(165,482		)	(106,724		)	(80,079		)	(352,285		)
Underwriting (loss) income	(49,469		)	119,668			207,434			277,633
Net investment income										157,564
Net realized investment gains										59,525
Amortization of intangible assets										(2,533		)
Interest expense										(56,510		)
Foreign exchange loss										(8,019		)
Income before income taxes										$	427,660
Loss and loss expense ratio	72.3		%	35.2		%	49.2		%	56.0		%
Acquisition cost ratio	13.3		%	(0.5		)%	17.2		%	12.6		%
General and administrative expense ratio	20.6		%	30.8		%	9.3		%	17.6		%
Combined ratio	106.2		%	65.5		%	75.7		%	86.2		%

Year Ended December 31, 2012	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	993,918		$	575,103		$	760,250		$	2,329,271
Net premiums written	743,428			346,348			748,047			1,837,823
Net premiums earned	671,594			336,787			740,517			1,748,898
Net losses and loss expenses	(465,168		)	(163,130		)	(510,966		)	(1,139,264		)
Acquisition costs	(86,670		)	486			(119,538		)	(205,722		)
General and administrative expenses	(141,729		)	(91,867		)	(73,725		)	(307,321		)
Underwriting (loss) income	(21,973		)	82,276			36,288			96,591
Net investment income										167,141
Net realized investment gains										306,436
Amortization of intangible assets										(2,533		)
Interest expense										(55,405		)
Foreign exchange loss										(783		)
Income before income taxes										$	511,447
Loss and loss expense ratio	69.3		%	48.4		%	69.0		%	65.1		%
Acquisition cost ratio	12.9		%	(0.1		)%	16.1		%	11.8		%
General and administrative expense ratio	21.1		%	27.3		%	10.0		%	17.6		%
Combined ratio	103.3		%	75.6		%	95.1		%	94.5		%

Year Ended December 31, 2011	U.S. Insurance			International Insurance			Reinsurance			Total
Gross premiums written	$	838,567		$	530,450		$	570,504		$	1,939,521
Net premiums written	639,196			325,094			569,476			1,533,766
Net premiums earned	584,303			317,006			555,683			1,456,992
Net losses and loss expenses	(387,099		)	(206,593		)	(365,464		)	(959,156		)
Acquisition costs	(74,976		)	2,781			(95,100		)	(167,295		)
General and administrative expenses	(124,434		)	(84,290		)	(62,932		)	(271,656		)
Underwriting (loss) income	(2,206		)	28,904			32,187			58,885
Net investment income										195,948
Net realized investment gains										10,077
Other income—termination fee										101,744
Amortization of intangible assets										(2,978		)
Interest expense										(54,989		)
Foreign exchange loss										(3,159		)
Income before income taxes										$	305,528
Loss and loss expense ratio	66.2		%	65.2		%	65.8		%	65.8		%
Acquisition cost ratio	12.8		%	(0.9		)%	17.1		%	11.5		%
General and administrative expense ratio	21.3		%	26.6		%	11.3		%	18.6		%
Combined ratio	100.3		%	90.9		%	94.2		%	95.9		%

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

The following table shows an analysis of the Company’s gross premiums written by geographic location of the Company’s subsidiaries. All intercompany premiums have been eliminated.

	Year Ended December 31,
	2013		2012		2011
United States	$	1,636,010	$	1,360,190	$	1,080,134
Bermuda	676,174		611,382		565,801
Europe	264,867		228,791		210,435
Singapore	142,393		111,694		68,382
Hong Kong	19,220		17,214		14,769
Total gross premiums written	$	2,738,664	$	2,329,271	$	1,939,521