CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Insurance premiums and contract charges earned	$ 179,739	$ 175,403
Net investment income	83,313	83,044
Net realized investment gains	6,068	1,699
Other income	999	1,119
Total revenues	270,119	261,265
Benefits, losses and expenses
Benefits, claims and settlement expenses	114,019	111,988
Interest credited	44,537	43,087
Policy acquisition expenses amortized	23,684	23,033
Operating expenses	35,928	39,947
Interest expense	3,552	3,546
Total benefits, losses and expenses	221,720	221,601
Income before income taxes	48,399	39,664
Income tax expense	14,124	11,298
Net income	34,275	28,366
Net income per share
Basic	$ 0.82	$ 0.69
Diluted	$ 0.81	$ 0.67
Weighted average number of shares and equivalent shares (in thousands)
Basic	41,950	41,180
Diluted	42,300	42,259
Net realized investment gains (losses)
Total other-than-temporary impairment losses on securities	(2,289)	0
Portion of losses recognized in other comprehensive income	0	0
Net other-than-temporary impairment losses on securities recognized in earnings	(2,289)	0
Realized gains, net	8,357	1,699
Total	$ 6,068	$ 1,699