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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows - operating activities      
Premiums collected $ 662,729 $ 661,094 $ 668,582
Policyholder benefits paid (484,144) (549,888) (496,339)
Policy acquisition and other operating expenses paid (230,072) (241,138) (232,363)
Federal income taxes (paid) recovered (14,444) (4,130) (25,049)
Investment income collected 303,385 280,963 270,468
Interest expense paid (13,948) (13,515) (13,605)
Contribution to defined benefit pension plan trust fund (2,534) (5,926) (1,307)
Other (18,124) (11,581) (12,633)
Net cash provided by operating activities 202,848 115,879 157,754
Fixed maturities      
Purchases (1,448,219) (1,356,092) (1,711,091)
Sales 576,708 587,909 673,882
Maturities, paydowns, calls and redemptions 585,615 362,210 608,994
Purchase of other invested asset (50,000)    
Net cash provided by (used in) short-term and other investments (18,902) 102,966 124,141
Net cash used in investing activities (354,798) (303,007) (304,074)
Cash flows - financing activities      
Dividends paid to shareholders (22,541) (18,990) (14,288)
Acquisition of treasury stock (15,735) (2,047)  
Exercise of stock options 5,421 2,127 4,167
Annuity contracts, variable and fixed deposits 417,600 433,896 395,469
Benefits, withdrawals and net transfers to Separate Account (variable annuity) assets (220,803) (219,415) (244,673)
Life policy accounts      
Deposits 1,881 2,078 2,060
Withdrawals and surrenders (5,161) (5,343) (5,015)
Change in bank overdrafts (983) (3,654) 6,680
Net cash provided by financing activities 159,679 188,652 144,400
Net increase (decrease) in cash 7,729 1,524 (1,920)
Cash at beginning of period 7,452 5,928 7,848
Cash at end of period $ 15,181 $ 7,452 $ 5,928