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Derivative Instruments (Change in Fair Value of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | $ 1,076,015 | $ 221,138 | $ (114,728)
Change in fair value of embedded derivatives | 133,968 | 286,899 | (105,194)
Call Options [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 932,003 | 228,610 | (93,582)
2015 Notes Hedges [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 145,751 | (2,488) | (21,002)
2015 Warrants [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | (9,568) | 0 | 0
Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 4,973 | (4,261) | (144)
Interest Rate Caps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 2,856 | (723) | 0
2015 Notes Embedded Derivative [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | 141,974 | (2,488) | (21,002)
Fixed Index Annuities - Embedded Derivatives [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | $ (8,006) | $ 289,387 | $ (84,192)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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