CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Insurance premiums and contract charges earned	$ 817,333	$ 794,703	$ 759,146
Net investment income	376,507	373,630	361,186
Net investment gains (losses)	(12,543)	(3,406)	4,123
Other income	10,302	6,623	4,455
Total revenues	1,191,599	1,171,550	1,128,910
Benefits, losses and expenses
Benefits, claims and settlement expenses	637,560	582,306	541,004
Interest credited	206,199	198,635	192,022
DAC amortization expense	109,889	102,185	96,732
Operating expenses	205,413	187,789	173,112
Interest expense	13,001	11,948	11,808
Total benefits, losses and expenses	1,172,062	1,082,863	1,014,678
Income before income taxes	19,537	88,687	114,232
Income tax expense (benefit)	1,194	(80,772)	30,467
Net income	$ 18,343	$ 169,459	$ 83,765
Net income per share
Basic (in usd per share)	$ 0.44	$ 4.10	$ 2.04
Diluted (in usd per share)	$ 0.44	$ 4.08	$ 2.02
Weighted average number of shares and equivalent shares
Basic (in shares)	41,570,492	41,364,546	41,158,349
Diluted (in shares)	41,894,232	41,564,979	41,475,516
Net investment gains (losses)
Total other-than-temporary impairment losses on securities	$ (1,530)	$ (12,620)	$ (11,401)
Portion of losses recognized in other comprehensive income (loss)	0	0	(290)
Net other-than-temporary impairment losses on securities recognized in earnings	(1,530)	(12,620)	(11,111)
Sales and other, net	3,491	7,756	16,286
Change in fair value - equity securities	(18,323)	0	0
Change in fair value and gains realized on settlements - derivative instruments	3,819	1,458	(1,052)
Total	$ (12,543)	$ (3,406)	$ 4,123