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Deferred Policy Acquisition Costs (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred Policy Acquisition Costs $ 3,543,925,000 $ 3,314,715,000 $ 3,355,275,000
Deferred Policy Acquisition Cost, Amortization Expense, Unrealized Investment Gains (Losses) (14,938,000) (7,448,000) (15,671,000)
Deferred Policy Acquisition Costs Foreign Currency 23,559,000 (5,822,000) 31,603,000
Deferred Policy Acquisition Costs 3,619,274,000 3,543,925,000 3,314,715,000
Deferred Policy Acquisition Costs Assumed [Member]
      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred Policy Acquisition Costs, Additions 1,081,599,000 947,014,000 885,450,000
Deferred Policy Acquisition Cost, Amortization Expense (975,844,000) (820,084,000) (831,979,000)
Deferred Policy Acquisition Costs Allocated to Change In Value Of Embedded Derivatives [Member]
      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred Policy Acquisition Cost, Amortization Expense (42,183,000) 114,877,000 (108,515,000)
Deferred Policy Acquisition Costs Retroceded [Member]
      
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Deferred Policy Acquisition Costs, Additions (11,814,000) (13,411,000) (13,838,000)
Deferred Policy Acquisition Cost, Amortization Expense $ 14,970,000 $ 14,084,000 $ 12,390,000