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Derivative Instruments (Change in Fair Value of Derivatives Included in the Consolidated Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | $ 48,493 | $ 373,962
Change in fair value of embedded derivatives | 92,619 | 363,272
Call Options [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | 71,473 | 344,654
2015 Notes Hedges [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | (20,401) | 28,098
Interest Rate Swap [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | (1,402) | 733
Interest Rate Caps [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of derivatives | (1,177) | 477
2015 Notes Embedded Conversion Derivative [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of embedded derivatives | (20,401) | 28,098
Fixed Index Annuities - Embedded Derivatives [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Change in fair value of embedded derivatives | $ 113,020 | $ 335,174

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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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