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Derivative Instruments (Change in Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives $ (336,146) $ 504,825 $ 1,076,015
Change in fair value of embedded derivatives (464,698) 32,321 133,968
Call Options [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives (327,921) 521,947 932,003
2015 Notes Hedges [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives (4,516) (8,934) 145,751
2015 Warrants [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives 0 0 (9,568)
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives (2,341) (4,863) 4,973
Interest Rate Caps [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of derivatives (1,368) (3,325) 2,856
Fixed Index Annuities - Embedded Derivatives [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of embedded derivatives (825,668) (532,337) (416,502)
Other Changes in Difference Between Policy Benefit Reserves Computed Using Derivative Accounting Vs. Long-Duration Contracts Accounting [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of embedded derivatives 365,486 579,885 408,496
2015 Notes Embedded Conversion Derivative [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of embedded derivatives (4,516) (19,036) 141,974
2029 Notes Embedded Conversion Derivative [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Change in fair value of embedded derivatives $ 0 $ 3,809 $ 0