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Quarterly Financial Information (Unaudited) (Unaudited Quarterly Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Premiums and product charges | $ 64,824 | $ 65,605 | $ 60,763 | $ 59,776 | $ 64,925 | $ 60,500 | $ 56,323 | $ 52,974 |  |  |
Net investment income | 554,355 | 549,391 | 533,282 | 510,784 | 512,709 | 500,202 | 493,489 | 485,597 | $ 2,147,812 | $ 1,991,997 | $ 1,849,872
Change in fair value of derivatives | (1,054,281) | 595,311 | 132,205 | (451,083) | 661,993 | 362,525 | 266,820 | 386,533 | (777,848) | 1,677,871 | 164,219
Net realized gains (losses) on investments, excluding OTTI losses | 3,097 | (2,196) | (38,381) | 302 | 2,719 | 1,579 | 3,873 | 2,338 | (37,178) | 10,509 | 11,524
Net OTTI losses recognized in operations | (18,980) | (14,373) | (2,396) | (907) | (3,076) | (464) | (949) | (141) | (36,656) | (4,630) | (22,679)
Loss on extinguishment of debt |  |  |  |  | 0 | (18,389) | (428) | 0 | 0 | (18,817) | 0
Total revenues | (450,985) | 1,193,738 | 685,473 | 118,872 | 1,239,270 | 905,953 | 819,128 | 927,301 | 1,547,098 | 3,891,652 | 2,220,282
Net income | $ 53,823 | $ 169,328 | $ 93,903 | $ 140,962 | $ 36,803 | $ 56,957 | $ 26,946 | $ 53,939 | $ 458,016 | $ 174,645 | $ 83,243
Earnings per common share | $ 0.59 | $ 1.87 | $ 1.04 | $ 1.57 | $ 0.41 | $ 0.64 | $ 0.30 | $ 0.61 | $ 5.07 | $ 1.96 | $ 0.98
Earnings per common share - assuming dilution | $ 0.59 | $ 1.85 | $ 1.03 | $ 1.55 | $ 0.41 | $ 0.63 | $ 0.30 | $ 0.60 | $ 5.01 | $ 1.93 | $ 0.97

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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