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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows-operating activities    
Premiums collected $ 160,661 $ 156,641
Policyholder benefits paid (110,618) (114,157)
Policy acquisition and other operating expenses paid (63,916) (62,929)
Federal income taxes paid (2,266)  
Investment income collected 70,500 62,577
Interest expense paid (300) (116)
Other (3,346) 660
Net cash provided by operating activities 50,715 42,676
Cash flows-investing activities    
Purchases (350,516) (389,308)
Sales 158,301 131,266
Maturities, paydowns, calls and redemptions 145,044 90,447
Net cash (used for) provided by short-term and other investments (781) 122,359
Net cash used in investing activities (47,952) (45,236)
Cash flows-financing activities    
Dividends paid to shareholders (5,372) (4,554)
Acquisition of treasury stock (3,337)  
Exercise of stock options 1,707 1,739
Annuity contracts, variable and fixed    
Deposits 92,000 92,499
Benefits, withdrawals and net transfers to Separate Account (variable annuity) assets (54,543) (57,058)
Life policy accounts    
Deposits 414 356
Withdrawals and surrenders (1,437) (1,113)
Change in bank overdrafts (4,264) 1,898
Net cash provided by financing activities 25,168 33,767
Net increase in cash 27,931 31,207
Cash at beginning of period 7,452 5,928
Cash at end of period $ 35,383 $ 37,135