CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net Income (Loss) Attributable to Parent	$ 169,507	$ 100,230
Change in operating assets and liabilities:
Accrued investment income	(10,688)	(10,484)
Premiums receivable and other reinsurance balances	163,965	(275,354)
Deferred policy acquisition costs	(17,784)	13,007
Reinsurance ceded receivable balances	(65,053)	(21,872)
Future policy benefits, other policy claims and benefits, and other reinsurance balances	119,620	466,983
Deferred income taxes	39,490	33,715
Other assets and other liabilities, net	(107,266)	(41,385)
Amortization of net investment premiums, discounts and other	(16,659)	(31,032)
Depreciation, Depletion and Amortization	11,017	10,294
Investment related (gains) losses, net	(7,788)	470
Other, net	62,260	(20,823)
Net cash provided by operating activities	340,621	223,749
Cash Flows from Investing Activities:
Sales of fixed maturity securities available-for-sale	3,139,794	1,898,722
Maturities of fixed maturity securities available-for-sale	195,625	195,549
Proceeds from Sale of Available-for-sale Securities, Equity	83	29,683
Payments to Acquire Mortgage Notes Receivable	(93,393)	(102,002)
Payments to Fund Policy Loans	(33,271)	(10,694)
Payments to Acquire Available-for-sale Securities	3,010,397	1,969,899
Payments to Acquire Available-for-sale Securities, Equity	(3,173)	(2,173)
Proceeds from Sale and Collection of Mortgage Notes Receivable	(240,411)	(141,131)
Increase (Decrease) in Funds Held under Reinsurance Agreements	36,995	(19,638)
Payments to Acquire Businesses, Net of Cash Acquired	(3,561)	24,864
Payments to Acquire Property, Plant, and Equipment	(10,440)	(5,292)
Change in short-term investments	25,422	(13,026)
Change in other invested assets	(97,012)	(23,353)
Net cash provided by investing activities	92,721	76,550
Cash Flows from Financing Activities:
Dividends to stockholders	(37,707)	(32,241)
Proceeds from (Repayments of) Secured Debt	(29,064)	(27,104)
Repayments of Long-term Debt	(690)	(662)
Purchases of treasury stock	(49,052)	(2,616)
Exercise of stock options, net	1,755	1,163
Change in cash collateral for derivative positions and other arrangements	(44,628)	19,537
Deposits on universal life and other investment type policies and contracts	44,926	83,004
Withdrawals on universal life and other investment type policies and contracts	(195,360)	(156,486)
Net cash used in financing activities	(309,820)	(115,405)
Effect of exchange rate changes on cash	7,141	21,989
Cash and Cash Equivalents, Period Increase (Decrease)	130,663	206,883
Cash and cash equivalents, beginning of period	1,889,733	1,303,524
Cash and cash equivalents, end of period	2,020,396	1,510,407
Supplemental disclosures of cash flow information:
Interest Paid, Excluding Capitalized Interest, Operating Activities	40,193	39,284
Income Taxes Paid, Net	3,076	6,356
Transfer to Investments	720,983	605,085
Capital Expenditures Incurred but Not yet Paid	1,311	0
Noncash or Part Noncash Acquisition, Value of Assets Acquired	8,303	59,184
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	11,864	(34,320)
Payments to Acquire Businesses, Gross	$ (3,561)	$ 24,864