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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows - operating activities    
Premiums collected $ 497,282 $ 498,747
Policyholder benefits paid (362,726) (425,327)
Policy acquisition and other operating expenses paid (177,154) (181,593)
Federal income taxes paid (14,728) (4,130)
Investment income collected 220,433 203,352
Interest expense paid (7,232) (6,897)
Contribution to defined benefit pension plan trust (2,534) (5,774)
Other (3,107) (2,328)
Net cash provided by operating activities 150,234 76,050
Fixed maturities    
Purchases (1,018,438) (1,016,995)
Sales 470,684 457,411
Maturities, paydowns, calls and redemptions 453,184 285,491
Net cash (used in) provided by short-term and other investments (132,423) 85,178
Net cash used in investing activities (226,993) (188,915)
Cash flows - financing activities    
Dividends paid to shareholders (16,001) (13,634)
Acquisition of treasury stock (13,640)  
Exercise of stock options 3,846 2,127
Annuity contracts, variable and fixed    
Deposits 302,870 318,872
Benefits, withdrawals and net transfers to Separate Account (variable annuity) assets (161,414) (161,576)
Life policy accounts    
Deposits 1,326 1,553
Withdrawals and surrenders (3,997) (4,066)
Change in bank overdrafts (1,763) 4,418
Net cash provided by financing activities 111,227 147,694
Net increase in cash 34,468 34,829
Cash at beginning of period 7,452 5,928
Cash at end of period $ 41,920 $ 40,757