Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investments:
Debt securities held to maturity, at amortized cost, net of allowance for credit losses ($4,940 and $0; fair value: $7,432,702 and $7,407,703)	$ 6,898,842	$ 7,106,245
Debt securities available for sale, at fair value (cost: $3,166,206 and $3,206,120)	3,373,113	3,356,945
Mortgage loans, net of allowance for credit losses ($2,227 and $675)	273,701	272,422
Policy loans	76,811	80,008
Derivatives, index options	66,738	157,588
Equity securities, at fair value (cost: $15,361 and $16,894)	17,918	23,594
Other long-term investments	70,585	62,090
Total investments	10,777,708	11,058,892
Cash and cash equivalents	450,703	253,525
Deferred policy acquisition costs	679,553	723,972
Deferred sales inducements	94,837	104,359
Value of business acquired	134,270	138,071
Accrued investment income	91,068	93,298
Other assets	163,592	181,330
Total assets	12,391,731	12,553,447
Future policy benefits:
Universal life and annuity contracts (Note 1)	9,040,773	9,303,233
Traditional life reserves	845,347	838,738
Other policyholder liabilities	135,870	127,607
Deferred Federal income tax liability (Note 1)	55,428	36,767
Federal income tax payable	1,458	3,748
Other liabilities	130,125	126,924
Total liabilities	10,209,001	10,437,017
COMMITMENTS AND CONTINGENCIES (Note 8)
Common stock:
Additional paid-in capital	41,716	41,716
Accumulated other comprehensive income (loss)	83,089	60,108
Retained earnings (Note 1)	2,057,889	2,014,570
Total stockholders’ equity	2,182,730	2,116,430
Total liabilities and stockholders' equity	12,391,731	12,553,447
Class A
Common stock:
Common stock, value outstanding	34	34
Class B
Common stock:
Common stock, value outstanding	$ 2	$ 2