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Reserve for Claims and Claim Expenses (Liability for Catastrophe Claims) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Liability for Catastrophe Claims [Line Items]
Prior years	$ (143,798)	$ (143,954)	$ (157,969)
Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(92,366)	(111,496)	(124,215)
Attritional Claims and Claim Expenses
Liability for Catastrophe Claims [Line Items]
Prior years	(51,432)	(32,458)	(33,754)
Reported Claims Less than Expected
Liability for Catastrophe Claims [Line Items]
Prior years	(51,432)	(22,300)	(20,640)
Actuarial Assumption Changes
Liability for Catastrophe Claims [Line Items]
Prior years		(10,158)	(13,114)
Large Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(65,537)	(94,527)	(76,390)
Storm Sandy (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(24,232)	(48,285)
April and May U.S. Tornadoes 2011 \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(13,939)
Thailand Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(11,754)		(9,433)
LIBOR (2011 and 2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(11,750)
Chile Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(24,575)
Hurricanes Gustav and Ike (2008) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,647)	(16,665)	(20,467)
U.K. Floods (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(17,271)
Hurricanes Katrina, Rita and Wilma (2005) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(7,730)
Tohoku Earthquake and Tsunami (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(5,131)	(19,033)	(3,896)
Hurricane Irene (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(4,506)		(7,130)
New Zealand Earthquake (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		(10,944)	17,912
Windstorm Kyrill (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(3,615)	(8,244)	(3,417)
Subprime (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	5,049
Hurricane Isaac (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		2,610
New Zealand Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	24,692	11,340	3,570
Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(13,704)	(5,306)	(3,953)
Small Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(26,829)	(16,969)	(47,825)
European Floods (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(7,552)
U.S. PCS 24 Wind and Thunderstorm (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,712)
U.S. PCS 83 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		(3,500)
U.S. PCS 76 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		(300)
U.S. PCS 70 and 73 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	13,362
U.S. PCS 70 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		8,225
Danish Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(5,000)
U.S. PCS 63 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(5,000)
U.S. PCS 42 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(2,560)
U.S. PCS 53 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(2,558)
Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(25,927)	(21,394)	(32,707)
Catastrophe Reinsurance
Liability for Catastrophe Claims [Line Items]
Prior years	(65,511)	(102,037)	(110,568)
Catastrophe Reinsurance \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(65,511)	(102,037)	(110,568)
Catastrophe Reinsurance \| Attritional Claims and Claim Expenses
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Catastrophe Reinsurance \| Reported Claims Less than Expected
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Catastrophe Reinsurance \| Actuarial Assumption Changes
Liability for Catastrophe Claims [Line Items]
Prior years		0	0
Catastrophe Reinsurance \| Large Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(47,506)	(85,068)	(62,743)
Catastrophe Reinsurance \| Storm Sandy (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(20,104)	(44,460)
Catastrophe Reinsurance \| April and May U.S. Tornadoes 2011 \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(13,939)
Catastrophe Reinsurance \| Thailand Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(9,254)		(3,933)
Catastrophe Reinsurance \| LIBOR (2011 and 2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Catastrophe Reinsurance \| Chile Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(24,575)
Catastrophe Reinsurance \| Hurricanes Gustav and Ike (2008) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,647)	(16,261)	(17,541)
Catastrophe Reinsurance \| U.K. Floods (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(17,271)
Catastrophe Reinsurance \| Hurricanes Katrina, Rita and Wilma (2005) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(6,420)
Catastrophe Reinsurance \| Tohoku Earthquake and Tsunami (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(3,489)	(18,033)	(3,896)
Catastrophe Reinsurance \| Hurricane Irene (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(4,506)		(4,630)
Catastrophe Reinsurance \| New Zealand Earthquake (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		(10,944)	17,912
Catastrophe Reinsurance \| Windstorm Kyrill (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(3,615)	(8,244)	(3,417)
Catastrophe Reinsurance \| Subprime (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Catastrophe Reinsurance \| Hurricane Isaac (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		2,610
Catastrophe Reinsurance \| New Zealand Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	24,692	11,040	3,570
Catastrophe Reinsurance \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(10,644)	(776)	(2,542)
Catastrophe Reinsurance \| Small Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(18,005)	(16,969)	(47,825)
Catastrophe Reinsurance \| European Floods (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(7,552)
Catastrophe Reinsurance \| U.S. PCS 24 Wind and Thunderstorm (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,712)
Catastrophe Reinsurance \| U.S. PCS 83 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		(3,500)
Catastrophe Reinsurance \| U.S. PCS 76 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		(300)
Catastrophe Reinsurance \| U.S. PCS 70 and 73 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	13,362
Catastrophe Reinsurance \| U.S. PCS 70 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		8,225
Catastrophe Reinsurance \| Danish Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(5,000)
Catastrophe Reinsurance \| U.S. PCS 63 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(5,000)
Catastrophe Reinsurance \| U.S. PCS 42 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(2,560)
Catastrophe Reinsurance \| U.S. PCS 53 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(2,558)
Catastrophe Reinsurance \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(17,103)	(21,394)	(32,707)
Specialty Reinsurance
Liability for Catastrophe Claims [Line Items]
Prior years	(55,909)	(34,111)	(34,146)
Specialty Reinsurance \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(11,419)	(2,463)	(3,000)
Specialty Reinsurance \| Attritional Claims and Claim Expenses
Liability for Catastrophe Claims [Line Items]
Prior years	(44,490)	(31,648)	(31,146)
Specialty Reinsurance \| Reported Claims Less than Expected
Liability for Catastrophe Claims [Line Items]
Prior years	(44,490)	(21,216)	(16,747)
Specialty Reinsurance \| Actuarial Assumption Changes
Liability for Catastrophe Claims [Line Items]
Prior years		(10,432)	(14,399)
Specialty Reinsurance \| Large Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(11,419)	(2,463)	(3,000)
Specialty Reinsurance \| Storm Sandy (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0
Specialty Reinsurance \| April and May U.S. Tornadoes 2011 \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Specialty Reinsurance \| Thailand Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(2,500)		0
Specialty Reinsurance \| LIBOR (2011 and 2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(10,500)
Specialty Reinsurance \| Chile Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Specialty Reinsurance \| Hurricanes Gustav and Ike (2008) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Specialty Reinsurance \| U.K. Floods (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Specialty Reinsurance \| Hurricanes Katrina, Rita and Wilma (2005) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			(3,000)
Specialty Reinsurance \| Tohoku Earthquake and Tsunami (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(1,642)	(1,000)	0
Specialty Reinsurance \| Hurricane Irene (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0		0
Specialty Reinsurance \| New Zealand Earthquake (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0	0
Specialty Reinsurance \| Windstorm Kyrill (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Specialty Reinsurance \| Subprime (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	5,049
Specialty Reinsurance \| Hurricane Isaac (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Specialty Reinsurance \| New Zealand Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	300	0
Specialty Reinsurance \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(1,826)	(1,763)	0
Specialty Reinsurance \| Small Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Specialty Reinsurance \| European Floods (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Specialty Reinsurance \| U.S. PCS 24 Wind and Thunderstorm (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Specialty Reinsurance \| U.S. PCS 83 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Specialty Reinsurance \| U.S. PCS 76 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Specialty Reinsurance \| U.S. PCS 70 and 73 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Specialty Reinsurance \| U.S. PCS 70 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Specialty Reinsurance \| Danish Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Specialty Reinsurance \| U.S. PCS 63 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Specialty Reinsurance \| U.S. PCS 42 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Specialty Reinsurance \| U.S. PCS 53 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Specialty Reinsurance \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Lloyd's
Liability for Catastrophe Claims [Line Items]
Prior years	(16,241)	(8,256)	(16,202)
Lloyd's \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(9,299)	(5,267)	(9,476)
Lloyd's \| Attritional Claims and Claim Expenses
Liability for Catastrophe Claims [Line Items]
Prior years	(6,942)	(2,989)	(6,726)
Lloyd's \| Reported Claims Less than Expected
Liability for Catastrophe Claims [Line Items]
Prior years	(6,942)	(3,263)	(8,011)
Lloyd's \| Actuarial Assumption Changes
Liability for Catastrophe Claims [Line Items]
Prior years		274	1,285
Lloyd's \| Large Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,612)	(5,267)	(9,476)
Lloyd's \| Storm Sandy (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(4,128)	(3,825)
Lloyd's \| April and May U.S. Tornadoes 2011 \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Lloyd's \| Thailand Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0		(5,500)
Lloyd's \| LIBOR (2011 and 2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(1,250)
Lloyd's \| Chile Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| Hurricanes Gustav and Ike (2008) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Lloyd's \| U.K. Floods (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| Hurricanes Katrina, Rita and Wilma (2005) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| Tohoku Earthquake and Tsunami (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Lloyd's \| Hurricane Irene (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0		(2,500)
Lloyd's \| New Zealand Earthquake (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0	0
Lloyd's \| Windstorm Kyrill (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Lloyd's \| Subprime (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Lloyd's \| Hurricane Isaac (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Lloyd's \| New Zealand Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Lloyd's \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(1,234)	(1,442)	(1,476)
Lloyd's \| Other \| Actuarial Assumption Changes
Liability for Catastrophe Claims [Line Items]
Prior years			(1,300)
Lloyd's \| Small Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(2,687)	0	0
Lloyd's \| European Floods (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Lloyd's \| U.S. PCS 24 Wind and Thunderstorm (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Lloyd's \| U.S. PCS 83 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Lloyd's \| U.S. PCS 76 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Lloyd's \| U.S. PCS 70 and 73 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Lloyd's \| U.S. PCS 70 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Lloyd's \| Danish Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| U.S. PCS 63 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| U.S. PCS 42 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| U.S. PCS 53 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Lloyd's \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(2,687)	0	0
Other
Liability for Catastrophe Claims [Line Items]
Prior years	(6,137)	450	2,947
Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,137)	(1,729)	(1,171)
Other \| Attritional Claims and Claim Expenses
Liability for Catastrophe Claims [Line Items]
Prior years	0	2,179	4,118
Other \| Reported Claims Less than Expected
Liability for Catastrophe Claims [Line Items]
Prior years	0	2,179	4,118
Other \| Actuarial Assumption Changes
Liability for Catastrophe Claims [Line Items]
Prior years		0	0
Other \| Large Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	(1,729)	(1,171)
Other \| Storm Sandy (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0
Other \| April and May U.S. Tornadoes 2011 \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Other \| Thailand Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0		0
Other \| LIBOR (2011 and 2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Other \| Chile Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Other \| Hurricanes Gustav and Ike (2008) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	(404)	(2,926)
Other \| U.K. Floods (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Other \| Hurricanes Katrina, Rita and Wilma (2005) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			1,690
Other \| Tohoku Earthquake and Tsunami (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Other \| Hurricane Irene (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0		0
Other \| New Zealand Earthquake (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0	0
Other \| Windstorm Kyrill (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Other \| Subprime (2007) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Other \| Hurricane Isaac (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Other \| New Zealand Earthquake (2010) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	0	0
Other \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0	(1,325)	65
Other \| Small Catastrophe Event \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	(6,137)	0	0
Other \| European Floods (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Other \| U.S. PCS 24 Wind and Thunderstorm (2013) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Other \| U.S. PCS 83 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Other \| U.S. PCS 76 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Other \| U.S. PCS 70 and 73 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	0
Other \| U.S. PCS 70 Wind and Thunderstorm (2012) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years		0
Other \| Danish Floods (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Other \| U.S. PCS 63 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Other \| U.S. PCS 42 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Other \| U.S. PCS 53 Winter Storm (2011) \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years			0
Other \| Other \| Catastrophe
Liability for Catastrophe Claims [Line Items]
Prior years	$ (6,137)	$ 0	$ 0