CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Insurance premiums and contract charges earned	$ 198,935	$ 191,050	$ 590,375	$ 564,860
Net investment income	92,320	94,847	275,025	270,685
Net realized investment gains (losses)	(3,486)	3,985	(1,656)	6,911
Other income	2,048	1,294	4,813	3,581
Total revenues	289,817	291,176	868,557	846,037
Benefits, losses and expenses
Benefits, claims and settlement expenses	134,895	135,710	444,870	403,631
Interest credited	50,078	48,658	148,200	142,924
Policy acquisition expenses amortized	24,210	24,474	73,904	73,113
Operating expenses	44,172	44,337	139,156	130,478
Interest expense	2,978	2,975	8,879	8,858
Total benefits, losses and expenses	256,333	256,154	815,009	759,004
Income before income taxes	33,484	35,022	53,548	87,033
Income tax expense	6,933	8,099	9,418	23,091
Net income	$ 26,551	$ 26,923	$ 44,130	$ 63,942
Net income per share
Basic (in usd per share)	$ 0.64	$ 0.66	$ 1.07	$ 1.55
Diluted (in usd per share)	$ 0.64	$ 0.65	$ 1.06	$ 1.55
Weighted average number of common and common equivalent shares (in thousands)
Basic (in shares)	41,433	41,092	41,337	41,155
Diluted (in shares)	41,575	41,347	41,467	41,386
Net realized investment gains (losses)
Total other-than-temporary impairment losses on securities	$ (6,091)	$ (160)	$ (12,452)	$ (7,686)
Portion of losses recognized in other comprehensive income	0	0	0	(290)
Net other-than-temporary impairment losses on securities recognized in earnings	(6,091)	(160)	(12,452)	(7,396)
Realized investment gains, net	2,605	4,145	10,796	14,307
Total	$ (3,486)	$ 3,985	$ (1,656)	$ 6,911