Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Premiums and other considerations	$ 39,382	$ 23,534	$ 26,480
Annuity product charges	251,227	240,035	224,488
Net investment income	2,182,078	2,307,635	2,147,812
Change in fair value of derivatives	34,666	906,906	(777,848)
Net realized gains (losses) on investments	(80,680)	6,962	(37,178)
Other than temporary impairment (OTTI) losses on investments:
Total OTTI losses	0	(18,511)	(35,005)
Portion of OTTI losses recognized from other comprehensive income	0	(215)	(1,651)
Net OTTI losses recognized in operations	0	(18,726)	(36,656)
Loss on extinguishment of debt	(2,024)	(2,001)	0
Total revenues	2,424,649	3,464,345	1,547,098
Benefits and expenses:
Insurance policy benefits and change in future policy benefits	49,742	35,418	39,530
Interest sensitive and index product benefits	1,543,270	1,287,576	1,610,835
Amortization of deferred sales inducements	438,164	88,585	222,201
Change in fair value of embedded derivatives	(1,286,787)	1,454,042	(1,389,491)
Interest expense on notes payable	25,552	25,525	25,498
Interest expense on subordinated debentures	5,557	15,764	15,491
Amortization of deferred policy acquisition costs	649,554	87,717	327,991
Other operating costs and expenses	183,636	154,153	129,301
Total benefits and expenses	1,608,688	3,148,780	981,356
Income before income taxes	815,961	315,565	565,742
Income tax expense	144,501	69,475	107,726
Net income	671,460	246,090	458,016
Less: Preferred stock dividends	33,515	0	0
Net income available to common stockholders	$ 637,945	$ 246,090	$ 458,016
Earnings per common share	$ 6.93	$ 2.70	$ 5.07
Earnings per common share - assuming dilution	$ 6.90	$ 2.68	$ 5.01
Weighted average common shares outstanding: earnings per common share	92,055,035	91,139,453	90,347,915
Weighted average common shares outstanding: earnings per common share - assuming dilution	92,392,496	91,782,242	91,422,585