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Reinsurance (Total Reinsurance Balances Segregated By Reinsurer) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
NJ Unsatisfied Claim Judgment Fund [Member]
Dec. 31, 2011
NJ Unsatisfied Claim Judgment Fund [Member]
Dec. 31, 2012
National Flood Insurance Program [Member]
Dec. 31, 2011
National Flood Insurance Program [Member]
Dec. 31, 2012
Other Federal And State Pools [Member]
Dec. 31, 2011
Other Federal And State Pools [Member]
Dec. 31, 2012
Total Federal And State Pools [Member]
Dec. 31, 2011
Total Federal And State Pools [Member]
Dec. 31, 2012
Remaining Unsecured Reinsurance [Member]
Dec. 31, 2011
Remaining Unsecured Reinsurance [Member]
Dec. 31, 2012
Hanover Ruckversicherungs AG [Member]
Dec. 31, 2011
Hanover Ruckversicherungs AG [Member]
Dec. 31, 2012
Munich Re Group [Member]
Dec. 31, 2011
Munich Re Group [Member]
Dec. 31, 2012
Swiss Re Group [Member]
Dec. 31, 2011
Swiss Re Group [Member]
Dec. 31, 2012
AXIS Reinsurance Company [Member]
Dec. 31, 2011
AXIS Reinsurance Company [Member]
Dec. 31, 2012
Partner Reinsurance Company Of The US [Member]
Dec. 31, 2011
Partner Reinsurance Company Of The US [Member]
Dec. 31, 2012
All Other Reinsurers [Member]
Dec. 31, 2011
All Other Reinsurers [Member]
Dec. 31, 2012
Allowance for Reinsurance Recoverable [Member]
Dec. 31, 2011
Allowance for Reinsurance Recoverable [Member]
Feb. 15, 2013
Hurricane Sandy [Member]
National Flood Insurance Program [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
National Flood Insurance Program [Member]
Feb. 15, 2013
Hurricane Sandy [Member]
Catatrophe excess of loss treaty [Member]
Dec. 31, 2012
Hurricane Sandy [Member]
Catatrophe excess of loss treaty [Member]
Allowance For Reinsurance Recoverable $ 8,706 $ 7,668 $ 8,091 $ 8,380                                             $ 4,800 $ 3,900        
Reinsurance recoverable, net 1,421,109 561,855                                                     621,100 839,100 29,900 68,400
Total prepaid reinsurance premiums 132,637 147,686                                                            
Less: collateral (139,335) [1] (146,364) [1]                                                            
Net unsecured reinsurance balances $ 1,414,411 $ 563,177     $ 68,655 [2] $ 69,179 [2] $ 1,028,685 [2] $ 267,600 [2] $ 5,749 [2] $ 4,235 [2] $ 1,103,089 [2] $ 341,014 [2] $ 311,322 $ 222,163 $ 60,358 $ 50,718 $ 66,283 $ 42,064 $ 52,189 $ 30,330 $ 35,064 $ 26,172 $ 20,074 $ 19,105 $ 77,354 $ 53,774            
% of unpaid NFIP claims ceded by federal government 100.00%                                                              
% of Net Unsecured Reinsurance         5.00% [2] 12.00% [2] 73.00% [2] 48.00% [2] 0.00% [2] 1.00% [2] 78.00% [2] 61.00% [2] 22.00% 39.00% 4.00% 9.00% 5.00% 7.00% 4.00% 5.00% 3.00% 5.00% 1.00% 3.00% 5.00% 10.00%            
[1] 1 Includes letters of credit, trust funds, and funds withheld.
[2] 2 Considered to have minimal risk of default.