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Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                      
Net reserves, Beginning of period       $ 1,156,132       $ 1,260,334 $ 1,156,132 $ 1,260,334 $ 1,565,230
Net incurred related to:                      
Current year                 993,168 431,476 195,518
Prior years                 (131,989) (302,131) (266,216)
Total net incurred 3,551 77,830 151,261 628,537 (27,128) 77,936 (18,803) 97,340 861,179 129,345 (70,698)
Net paid related to:                      
Current year                 299,299 50,793 42,712
Prior years                 129,687 182,754 191,486
Total net paid                 428,986 233,547 234,198
Total net reserves, End of period 1,588,325       1,156,132       1,588,325 1,156,132 1,260,334
Reinsurance recoverable, End of period 404,029       101,711       404,029 101,711 84,099
Total gross reserves, End of period $ 1,992,354       $ 1,257,843       $ 1,992,354 $ 1,257,843 $ 1,344,433