Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 1,100,000		$ 1,100,000
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	52,600,000		52,600,000		23,900,000
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	14,689,000	(24,451,000)	48,313,000	(137,240,000)
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk	(500,000)	1,000,000	(1,800,000)	(1,000,000)
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk	$ 1,000,000	$ (3,700,000)	$ 1,600,000	$ (8,600,000)