Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investments
Fixed maturities, available for sale, at fair value (amortized cost 2012, $5,136,280; 2011, $4,984,389)	$ 5,782,052	$ 5,421,832
Equity securities, available for sale, at fair value (cost 2012, $37,292; 2011, $23,070)	39,211	26,774
Short-term and other investments	353,504	228,902
Total investments	6,174,767	5,677,508
Cash	41,920	7,452
Deferred policy acquisition costs	216,493	216,456
Goodwill	47,396	47,396
Other assets	235,907	212,593
Separate Account (variable annuity) assets	1,405,693	1,273,764
Total assets	8,122,176	7,435,169
Policy liabilities
Fixed annuity contract liabilities	3,170,489	2,945,107
Interest-sensitive life contract liabilities	757,132	743,384
Unpaid claims and claim expenses	301,332	294,809
Future policy benefits	213,114	208,715
Unearned premiums	214,999	208,963
Total policy liabilities	4,657,066	4,400,978
Other policyholder funds	107,235	114,530
Other liabilities	481,971	352,800
Short-term debt	38,000	38,000
Long-term debt	199,793	199,744
Separate Account (variable annuity) liabilities	1,405,693	1,273,764
Total liabilities	6,889,758	6,379,816
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2012, 62,207,465; 2011, 61,803,462	62	62
Additional paid-in capital	380,071	373,384
Retained earnings	896,683	840,644
Accumulated other comprehensive income (loss) net of taxes:
Net unrealized gains and losses on fixed maturities and equity securities	396,201	268,222
Net funded status of pension and other postretirement benefit obligations	(16,242)	(16,242)
Treasury stock, at cost, 2012, 22,829,116 shares; 2011, 22,028,030 shares	(424,357)	(410,717)
Total shareholders' equity	1,232,418	1,055,353
Total liabilities and shareholders' equity	$ 8,122,176	$ 7,435,169