CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Insurance premiums and contract charges earned	$ 205,610	$ 195,718	$ 408,608	$ 391,440
Net investment income	97,101	91,994	188,965	182,705
Net investment gains (losses)	735	2,072	(919)	1,830
Other income	2,811	1,652	5,092	2,765
Total revenues	306,257	291,436	601,746	578,740
Benefits, losses and expenses
Benefits, claims and settlement expenses	168,278	165,879	311,840	309,975
Interest credited	51,071	49,348	101,105	98,122
DAC amortization expense	26,586	24,808	53,291	49,694
Operating expenses	50,218	46,228	98,387	94,984
Interest expense	3,291	2,945	6,464	5,901
Total benefits, losses and expenses	299,444	289,208	571,087	558,676
Income before income taxes	6,813	2,228	30,659	20,064
Income tax expense (benefit)	896	(33)	4,587	2,485
Net income	$ 5,917	$ 2,261	$ 26,072	$ 17,579
Net income per share
Basic (in usd per share)	$ 0.14	$ 0.05	$ 0.63	$ 0.43
Diluted (in usd per share)	$ 0.14	$ 0.05	$ 0.63	$ 0.42
Weighted average number of shares and equivalent shares
Basic (in shares)	41,600	41,368	41,531	41,268
Diluted (in shares)	41,735	41,493	41,659	41,416
Net investment gains (losses)
Total other-than-temporary impairment losses on securities	$ (1,177)	$ (3,564)	$ (1,287)	$ (1,777)
Portion of losses recognized in other comprehensive income	0	0	0	(4,583)
Net other-than-temporary impairment losses on securities recognized in earnings	(1,177)	(3,564)	(1,287)	(6,360)
Sales and other, net	1,789	5,202	3,992	7,685
Change in fair value - equity securities	(1,156)	0	(6,342)	0
Change in fair value and gains (losses) realized on settlements - derivative instruments	1,279	434	2,718	505
Net investment gains (losses)	$ 735	$ 2,072	$ (919)	$ 1,830