Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income	$ 460,685	$ 278,161
Adjustments to reconcile net income to net cash provided by operating activities
Net realized investment gains	(31,943)	(4,775)
Other-than-temporary impairments	6,968	0
Accretion of premiums, discounts and loan origination fees	(3,862)	(4,303)
Net capitalized interest on policy loans and mortgage loans	(25,719)	(29,250)
Depreciation	40,760	39,241
Interest credited to policyholders’ account balances	371,703	309,694
Charges to policyholders’ account balances	(226,178)	(213,317)
Deferred federal income tax expense	79,356	68,769
Equity in earnings of unconsolidated affiliates	(102,325)	(18,905)
Distributions from equity method investments	103,128	16,375
Changes in
Policyholder liabilities	168,352	281,596
Deferred policy acquisition costs	(22,391)	(45,876)
Reinsurance recoverables	(7,318)	(41,536)
Premiums due and other receivables	(15,989)	(63,272)
Prepaid reinsurance premiums	2,483	7,587
Accrued investment income	(3,030)	1,249
Current tax receivable/payable	(5,335)	1,454
Liability for retirement benefits	(2,956)	(63,249)
Fair value of option securities	(95,885)	(58,396)
Fair value of equity securities	(282,026)	(150,487)
Other, net	(13,282)	53,782
Net cash provided by operating activities	395,196	364,542
Proceeds from sale/maturity/prepayment of
Held-to-maturity securities	502,141	492,160
Available-for-sale securities	329,489	348,149
Equity securities	178,817	164,413
Investment real estate	64,459	11,577
Mortgage loans	626,449	467,040
Policy loans	33,096	42,071
Other invested assets	53,350	84,846
Disposals of property and equipment	69	93
Distributions from unconsolidated affiliates	78,014	35,684
Payment for the purchase/origination of
Held-to-maturity securities	(1,121,049)	(1,011,398)
Available-for-sale securities	(458,635)	(436,877)
Equity securities	(49,016)	(40,981)
Investment real estate	(22,218)	(35,583)
Mortgage loans	(419,144)	(834,877)
Policy loans	(19,935)	(18,268)
Other invested assets	(46,221)	(61,407)
Additions to property and equipment	(16,094)	(13,527)
Contributions to unconsolidated affiliates	(194,846)	(100,567)
Change in short-term investments	(192,188)	441,544
Change in collateral held for derivatives	75,827	40,243
Other, net	3,857	(5,795)
Net cash used in investing activities	(593,778)	(431,460)
FINANCING ACTIVITIES
Policyholders’ account deposits	1,559,231	1,378,325
Policyholders’ account withdrawals	(1,126,580)	(1,012,522)
Change in notes payable	21,080	45
Dividends to stockholders	(66,195)	(66,182)
Payments to noncontrolling interest	(20,811)	(1,810)
Net cash provided by financing activities	366,725	297,856
NET INCREASE IN CASH AND CASH EQUIVALENTS	168,143	230,938
Beginning of the period	268,164	375,837
End of the period	$ 436,307	$ 606,775