Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 162,540	$ 141,924
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Change in future policy benefits and other policy liabilities	177,744	167,886
Deferral of policy acquisition costs	(281,397)	(243,346)
Amortization of deferred policy acquisition costs	127,277	113,392
Change in income taxes	51,598	31,349
Realized investment (gains) losses, including other-than-temporary impairments	(2,623)	(1,623)
Accretion and amortization of investments	(1,091)	(1,094)
Depreciation and amortization	10,879	8,201
Change in due from reinsurers	(34,907)	(33,248)
Change in agent balances, due premiums and other receivables	(36,160)	(21,553)
Trading securities sold, matured, or called (acquired), net	(6,917)	1,143
Share-based compensation	11,754	12,918
Change in other operating assets and liabilities, net	(13,809)	(34,957)
Net cash provided by (used in) operating activities	164,888	140,992
Available-for-sale investments sold, matured or called:
Fixed-maturity securities — sold	76,540	104,097
Fixed-maturity securities — matured or called	195,803	201,722
Equity securities	4,864	4,700
Available-for-sale investments acquired:
Fixed-maturity securities	(228,986)	(264,457)
Equity securities	(1,074)	(794)
Purchases of property and equipment and other investing activities, net	(11,410)	(5,924)
Cash collateral received (returned) on loaned securities, net	24,361	33,009
Sales (purchases) of short-term investments using securities lending collateral, net	(24,361)	(33,009)
Net cash provided by (used in) investing activities	35,737	39,344
Cash flows from financing activities:
Dividends paid	(24,956)	(24,915)
Common stock repurchased	(131,570)	(181,121)
Excess tax benefits on share-based compensation	1,684	4,624
Tax withholdings on share-based compensation	(3,757)	(6,101)
Cash proceeds from stock options exercised		136
Net cash provided by (used in) financing activities	(158,599)	(207,377)
Effect of foreign exchange rate changes on cash	1,003	(4,395)
Change in cash and cash equivalents	43,029	(31,436)
Cash and cash equivalents, beginning of period	152,294	191,997
Cash and cash equivalents, end of period	$ 195,323	$ 160,561