Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES
Net income	$ 354,742	$ 102,320
Adjustments to reconcile net income to net cash provided by operating activities
Net realized investment gains	(10)	(6,051)
Other-than-temporary impairments	6,968	0
Accretion of premiums, discounts and loan origination fees	(2,547)	(4,736)
Net capitalized interest on policy loans and mortgage loans	(18,397)	(20,555)
Depreciation	30,621	25,783
Interest credited to policyholders’ account balances	264,921	176,276
Charges to policyholders’ account balances	(149,394)	(142,477)
Deferred federal income tax expense	61,314	9,613
Equity in earnings of unconsolidated affiliates	(57,250)	(5,876)
Distributions from equity method investments	64,224	371
Changes in
Policyholder liabilities	120,652	205,125
Deferred policy acquisition costs	(23,939)	(37,082)
Reinsurance recoverables	(9,677)	(17,543)
Premiums due and other receivables	(18,313)	(46,680)
Prepaid reinsurance premiums	2,627	7,835
Accrued investment income	(8,945)	(3,559)
Current tax receivable/payable	10,223	43,453
Liability for retirement benefits	(1,969)	(2,479)
Fair value of option securities	(89,608)	(7,534)
Fair value of equity securities	(273,437)	(23,992)
Other, net	(31,034)	1,911
Net cash provided by operating activities	231,772	254,123
Proceeds from sale/maturity/prepayment of
Held-to-maturity securities	299,968	395,053
Available-for-sale securities	164,925	277,143
Equity securities	149,397	24,369
Investment real estate	6,713	11,577
Mortgage loans	405,768	219,153
Policy loans	22,873	28,747
Other invested assets	41,262	50,238
Disposals of property and equipment	69	0
Distributions from unconsolidated affiliates	37,309	10,105
Payment for the purchase/origination of
Held-to-maturity securities	(647,367)	(780,263)
Available-for-sale securities	(355,920)	(317,902)
Equity securities	(18,280)	(36,894)
Investment real estate	(19,520)	(23,640)
Mortgage loans	(283,312)	(561,586)
Policy loans	(12,033)	(12,886)
Other invested assets	(38,768)	(46,212)
Additions to property and equipment	(9,494)	(8,825)
Contributions to unconsolidated affiliates	(111,620)	(56,907)
Change in short-term investments	(390,423)	355,880
Change in collateral held for derivatives	83,169	(1,532)
Other, net	1,397	(5,739)
Net cash used in investing activities	(673,887)	(480,121)
FINANCING ACTIVITIES
Policyholders’ account deposits	1,288,581	973,556
Policyholders’ account withdrawals	(776,888)	(636,727)
Change in notes payable	21,614	(728)
Dividends to stockholders	(44,145)	(44,136)
Payments to noncontrolling interest	(2,376)	(570)
Net cash provided by financing activities	486,786	291,395
NET INCREASE IN CASH AND CASH EQUIVALENTS	44,671	65,397
Beginning of the period	268,164	375,837
End of the period	$ 312,835	$ 441,234