Fair Values of Financial Instruments (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Oct. 22, 2013	Aug. 26, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Level 1 to Level 2 transfers, amount	$ 0
Liabilities, Level 1 to Level 2 transfers, amount	0
Assets, Level 2 to Level 1 transfers, amount	0
Liabilities, Level 2 to Level 1 transfers, amount	0
Assets, transfers into Level 3, amount	0
Liabilities, transfers into Level 3, amount	0
Assets, transfers out of Level 3, amount	0
Liabilities, transfers out of Level 3, amount	0
Other investments	212,870,000			196,366,000
Percentage of outstanding call options and warrants settled pursuant to agreement		50.00%	50.00%
Fair Value, Sensitivity, Increase in Discount Rate by 10 Percent [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, sensitivity, discount rate adjustment (basis points)	100
Fixed index annuities embedded derivative, adjustment due to change in discount rate	(255,400,000)
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate	(155,200,000)
Fair Value, Sensitivity, Decrease in Discount Rate by 10 Percent [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, sensitivity, discount rate adjustment (basis points)	100
Fixed index annuities embedded derivative, adjustment due to change in discount rate	283,600,000
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate	168,800,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	$ 0