CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Insurance premiums and contract charges earned	$ 202,998	$ 195,722
Net investment income	91,864	90,711
Net investment losses	(1,654)	(242)
Other income	2,281	1,113
Total revenues	295,489	287,304
Benefits, losses and expenses
Benefits, claims and settlement expenses	143,562	144,096
Interest credited	50,035	48,774
DAC amortization expense	26,705	24,886
Operating expenses	48,169	48,756
Interest expense	3,172	2,956
Total benefits, losses and expenses	271,643	269,468
Income before income taxes	23,846	17,836
Income tax expense	3,691	2,518
Net income	$ 20,155	$ 15,318
Net income per share
Basic (in usd per share)	$ 0.49	$ 0.37
Diluted (in usd per share)	$ 0.48	$ 0.37
Weighted average number of shares and equivalent shares
Basic (in shares)	41,497	41,135
Diluted (in shares)	41,653	41,342
Net investment losses
Total other-than-temporary impairment losses on securities	$ (110)	$ (2,797)
Portion of losses recognized in other comprehensive income	0	0
Net other-than-temporary impairment losses on securities recognized in earnings	0	(1,777)
Net other-than-temporary impairment losses on securities recognized in earnings	(110)	(2,797)
Sales and other	2,203	2,484
Change in fair value - equity securities (1)	(5,186)	0
Change in fair value and gains (losses) realized on settlements - derivative instruments	1,439	71
Net investment losses	$ (1,654)	$ (242)