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Investments (Details 22) (USD $)
 9 Months Ended
Sep. 30, 2012
Amortized Cost Recorded Investment [Member] | Corporate Debt Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments $ 2,585,095,000
Amortized Cost Recorded Investment [Member] | Asset Backed Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 137,251,000
Amortized Cost Recorded Investment [Member] | Commercial Mortgage Backed Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 703,313,000
Amortized Cost Recorded Investment [Member] | US Government Corporations and Agencies Securities [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 240,952,000
Amortized Cost Recorded Investment [Member] | US States And Political Subdivisions Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 27,297,000
Amortized Cost Recorded Investment [Member] | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 56,776,000
Amortized Cost Recorded Investment [Member] | Equity Securities Other Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 0
Amortized Cost Recorded Investment [Member] | Mortgage Loans On Real Estate Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 1,009,454,000
Amortized Cost Recorded Investment [Member] | Short Term Investments Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 101,428,000
Amortized Cost Recorded Investment [Member] | Cash and Cash Equivalents [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 501,593,000
Amortized Cost Recorded Investment [Member] | Accrued Income Receivable [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 43,739,000
Amortized Cost Recorded Investment [Member] | Availableforsale Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 3,750,684,000
Amortized Cost Recorded Investment [Member] | Total Transfer Of Investments [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 5,406,898,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 2,606,816,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset Backed Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 138,918,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Mortgage Backed Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 704,065,000
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Corporations and Agencies Securities [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 256,168,000
Estimate of Fair Value, Fair Value Disclosure [Member] | US States And Political Subdivisions Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 27,555,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 55,437,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity Securities Other Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage Loans On Real Estate Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 1,021,661,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Short Term Investments Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 101,338,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash and Cash Equivalents [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 501,593,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Accrued Income Receivable [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 43,739,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Availableforsale Securities Member
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments 3,788,959,000
Estimate of Fair Value, Fair Value Disclosure [Member] | Total Transfer Of Investments [Member]
  
Noncash Investing And Financing Items [Line Items]  
Transfer of Investments $ 5,457,290,000