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Quarterly Financial Information (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Premiums and product charges | $ 60,508 | $ 60,406 | $ 52,582 | $ 43,850 | $ 47,781 | $ 46,310 | $ 42,446 | $ 35,679 |  |  |
Net investment income | 475,633 | 463,583 | 459,830 | 450,826 | 438,262 | 436,085 | 418,176 | 399,669 | $ 1,849,872 | $ 1,692,192 | $ 1,531,667
Change in fair value of derivatives | 95,391 | 103,794 | 39,099 | (74,065) | 69,338 | (351,360) | (23,024) | (31,100) | 164,219 | (336,146) | 504,825
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses | 844 | 5,256 | 2,737 | 2,687 | (151) | 1,159 | 4,324 | 4,879 | 11,524 | 10,211 | (4,003)
Net OTTI losses recognized in operations | (9,560) | (2,979) | (4,446) | (5,694) | (13,347) | (5,229) | (828) | (132) | (22,679) | (19,536) | (2,627)
Total revenues | 622,816 | 630,060 | 549,802 | 417,604 | 541,883 | 126,965 | 441,094 | 408,995 | 2,220,282 | 1,518,937 | 2,168,973
Net income | $ 120,796 | $ (7,420) | $ 14,708 | $ (44,841) | $ 33,776 | $ 97,306 | $ 82,845 | $ 5,903 | $ 83,243 | $ 219,830 | $ 126,023
Earnings (loss) per common share | $ 1.37 | $ (0.09) | $ 0.18 | $ (0.55) | $ 0.41 | $ 1.22 | $ 1.07 | $ 0.08 | $ 0.98 | $ 2.78 | $ 1.69
Earnings (loss) per common share—assuming dilution | $ 1.35 | $ (0.09) | $ 0.18 | $ (0.55) | $ 0.40 | $ 1.19 | $ 1.05 | $ 0.07 | $ 0.97 | $ 2.72 | $ 1.58

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- Definition Item represents a combination of insurance policy charges and premiums earned, net. Policy charges represent an amount that an insurer adds to a policy's premium, or deducts from a policy's cash value or contract holder's account, as compensation for services rendered; may include fees. Premiums earned, net, represents premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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