CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues
Insurance premiums and contract charges earned	$ 173,761	$ 167,904	$ 514,480	$ 499,743
Net investment income	78,466	76,649	233,230	228,658
Net realized investment gains (losses)	(1,407)	10,762	20,872	21,060
Other income	1,064	1,233	3,470	5,936
Total revenues	251,884	256,548	772,052	755,397
Benefits, losses and expenses
Benefits, claims and settlement expenses	112,701	106,051	346,165	344,913
Interest credited	42,924	41,411	126,430	121,844
Policy acquisition expenses amortized	20,911	20,406	63,985	60,538
Operating expenses	41,407	37,955	119,239	114,382
Interest expense	3,553	3,556	10,656	10,666
Total benefits, losses and expenses	221,496	209,379	666,475	652,343
Income before income taxes	30,388	47,169	105,577	103,054
Income tax expense	6,789	14,903	28,971	31,014
Net income	23,599	32,266	76,606	72,040
Net income per share
Basic	$ 0.59	$ 0.82	$ 1.93	$ 1.82
Diluted	$ 0.57	$ 0.78	$ 1.85	$ 1.74
Weighted average number of shares and equivalent shares (in thousands)
Basic	40,001	39,381	39,767	39,572
Diluted	41,732	41,138	41,363	41,295
Net realized investment gains (losses)
Total other-than-temporary impairment losses on securities	(11)	0	(974)	0
Portion of losses recognized in other comprehensive income	0	0	0	0
Net other-than-temporary impairment losses on securities recognized in earnings	(11)	0	(974)	0
Realized gains (losses), net	(1,396)	10,762	21,846	21,060
Total	$ (1,407)	$ 10,762	$ 20,872	$ 21,060