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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
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