Summary of Significant Accounting Policies (Narrative Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Goodwill	$ 7,000,000	$ 7,000,000
Value of Business Acquired (VOBA)	600,000	800,000
Accumulated Amortization Of Value Of Business Acquired VOBA	24,800,000	24,600,000
Amortization of Value of Business Acquired (VOBA)	200,000	200,000	12,300,000
Values Of Business Acquired Distribution Agreements And Customer Relationships	95,900,000	106,300,000
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	24,800,000	14,300,000
Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	10,500,000	10,900,000
Future Amortization Expense, Year One	10,100,000
Future Amortization Expense, Year Two	9,500,000
Future Amortization Expense, Year Three	9,400,000
Future Amortization Expense, Year Four	9,000,000
Future Amortization Expense, Year Five	8,700,000
Capitalized Computer Software, Net	43,200,000	33,000,000
Capitalized Computer Software, Amortization	6,500,000	4,300,000	4,000,000
Traditional Life, Interest Rate, Low End	3.00%
Traditional Life, Interest Rate, High End	6.00%
Maximum Life Insurance Retention Per Individual Life	8,000,000
Retrocession Pool Participants Minimum AM Best Rating	"A-(excellent)"	"A-(excellent)"
Claims Recoverable From Retrocessionaires Past Due	10,400,000	11,400,000
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Deferred Aquisition Costs		470,100,000
Reinsurance Claims Recoverables	156,000,000	151,900,000
New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity		$ 318,400,000