Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 45,176	$ 43,401
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Change in future policy benefits and other policy liabilities	60,985	47,672
Deferral of policy acquisition costs	(86,925)	(75,434)
Amortization of deferred policy acquisition costs	43,129	36,213
Change in income taxes	20,855	18,576
Realized investment (gains) losses, including other-than-temporary impairments	783	(1,284)
Accretion and amortization of investments	(597)	(438)
Depreciation and amortization	3,139	2,633
Change in due from reinsurers	(28,825)	(6,956)
Change in premiums and other receivables	(12,919)	456
Trading securities sold, matured, or called (acquired), net	(2,268)	365
Share-based compensation	7,483	8,943
Change in other operating assets and liabilities, net	(15,099)	(10,809)
Net cash provided by (used in) operating activities	34,917	63,338
Available-for-sale investments sold, matured or called:
Fixed-maturity securities — sold	25,104	23,278
Fixed-maturity securities — matured or called	86,609	72,979
Equity securities		1,659
Available-for-sale investments acquired:
Fixed-maturity securities	(55,886)	(122,264)
Equity securities	(99)	(625)
Purchases of property and equipment and other investing activities, net	(7,761)	(1,635)
Cash collateral received (returned) on loaned securities, net	15,901	5,411
Sales (purchases) of short-term investments using securities lending collateral, net	(15,901)	(5,411)
Net cash provided by (used in) investing activities	47,967	(26,608)
Cash flows from financing activities:
Dividends paid	(8,295)	(8,517)
Common stock repurchased	(49,945)	(38,749)
Excess tax benefits on share-based compensation	405	3,456
Tax withholdings on share-based compensation	(3,040)	(6,041)
Cash proceeds from stock options exercised		136
Net cash provided by (used in) financing activities	(60,875)	(49,715)
Effect of foreign exchange rate changes on cash	1,414	(2,388)
Change in cash and cash equivalents	23,423	(15,373)
Cash and cash equivalents, beginning of period	152,294	191,997
Cash and cash equivalents, end of period	$ 175,717	$ 176,624