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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows - operating activities    
Premiums collected $ 351,404 $ 335,344
Policyholder benefits paid (242,035) (235,046)
Policy acquisition and other operating expenses paid (135,428) (136,046)
Federal income taxes paid (17,363) (22,545)
Investment income collected 161,033 152,500
Interest expense paid (7,005) (6,972)
Other (2,490) (1,908)
Net cash provided by operating activities 108,116 85,327
Fixed maturities    
Purchases (657,797) (677,196)
Sales 99,249 213,986
Maturities, paydowns, calls and redemptions 177,370 254,763
Purchase of other invested assets 0 (10,000)
Net cash provided by (used in) short-term and other investments 139,984 (18,971)
Net cash used in investing activities (241,194) (237,418)
Cash flows - financing activities    
Dividends paid to shareholders (19,614) (16,160)
Acquisition of treasury stock (3,867) (3,884)
Exercise of stock options 7,262 9,394
Annuity contracts: variable, fixed and FHLB funding agreements    
Deposits 218,331 188,562
Benefits, withdrawals and net transfers to Separate Account (variable annuity) assets (159,680) (135,036)
Life policy accounts    
Deposits 476 801
Withdrawals and surrenders (2,410) (2,410)
Cash received related to repurchase agreements 114,083 133,980
Change in bank overdrafts 5,011 (456)
Net cash provided by financing activities 159,592 174,791
Net increase in cash 26,514 22,700
Cash at beginning of period 18,189 15,181
Cash at end of period $ 44,703 $ 37,881