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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Investments    
Fixed maturities, available for sale, at fair value (amortized cost 2013, $5,509,859; 2012, $5,311,457) $ 6,143,673 $ 5,962,232
Equity securities, available for sale, at fair value (cost 2013, $53,117; 2012, $52,396) 58,661 53,503
Short-term and other investments 223,765 276,362
Total investments 6,426,099 6,292,097
Cash 49,896 15,181
Deferred policy acquisition costs 199,000 196,885
Goodwill 47,396 47,396
Other assets 226,703 217,886
Separate Account (variable annuity) assets 1,508,260 1,398,281
Total assets 8,457,354 8,167,726
Policy liabilities    
Fixed annuity contract liabilities 3,311,013 3,257,758
Interest-sensitive life contract liabilities 765,689 761,671
Unpaid claims and claim expenses 300,853 289,395
Future policy benefits 217,015 214,562
Unearned premiums 207,060 213,268
Total policy liabilities 4,801,630 4,736,654
Other policyholder funds 101,032 103,227
Other liabilities 546,924 445,952
Short-term debt 38,000 38,000
Long-term debt 199,825 199,809
Separate Account (variable annuity) liabilities 1,508,260 1,398,281
Total liabilities 7,195,671 6,921,923
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, 2013, 62,700,637; 2012, 62,311,787 63 62
Additional paid-in capital 390,231 383,135
Retained earnings 940,929 921,969
Accumulated other comprehensive income (loss), net of taxes:    
Net unrealized gains on fixed maturities and equity securities 374,066 382,400
Net funded status of pension and other postretirement benefit obligations (15,311) (15,311)
Treasury stock, at cost, 2013, 23,033,574 shares; 2012, 22,943,925 shares (428,295) (426,452)
Total shareholders' equity 1,261,683 1,245,803
Total liabilities and shareholders' equity $ 8,457,354 $ 8,167,726