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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows - operating activities    
Premiums collected $ 164,261 $ 160,661
Policyholder benefits paid (112,825) (110,618)
Policy acquisition and other operating expenses paid (78,740) (63,916)
Federal income taxes paid (6,976) (2,266)
Investment income collected 71,483 70,500
Interest expense paid (237) (300)
Other (2,549) (3,346)
Net cash provided by operating activities 34,417 50,715
Fixed maturities    
Purchases (380,564) (350,516)
Sales 99,182 158,292
Maturities, paydowns, calls and redemptions 118,975 145,044
Purchase of other invested asset   (25,000)
Net cash provided by short-term and other investments 52,227 24,228
Net cash used in investing activities (110,180) (47,952)
Cash flows - financing activities    
Dividends paid to shareholders (8,052) (5,372)
Acquisition of treasury stock (1,843) (3,337)
Exercise of stock options 4,410 1,707
Annuity contracts, variable and fixed    
Deposits 90,181 92,000
Benefits, withdrawals and net transfers to Separate Account (variable annuity) assets (61,969) (54,543)
Life policy accounts    
Deposits 311 414
Withdrawals and surrenders (1,091) (1,437)
Cash received related to repurchase agreements 87,833  
Change in bank overdrafts 698 (4,264)
Net cash provided by financing activities 110,478 25,168
Net increase in cash 34,715 27,931
Cash at beginning of period 15,181 7,452
Cash at end of period $ 49,896 $ 35,383