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Schedule II Condensed Financial Information of Registrant (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows - operating activities      
Interest expense paid $ (13,948) $ (13,515) $ (13,605)
Federal income taxes (paid) recovered (14,444) (4,130) (25,049)
Other, net (18,124) (11,581) (12,633)
Net cash provided by operating activities 202,848 115,879 157,754
Cash flows - investing activities      
Net cash provided by (used in) investing activities (354,798) (303,007) (304,074)
Cash flows - financing activities      
Dividends paid to shareholders (22,541) (18,990) (14,288)
Exercise of stock options 5,421 2,127 4,167
Net cash used in 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
Parent Company [Member]
      
Cash flows - operating activities      
Interest expense paid (13,948) (13,515) (13,605)
Federal income taxes (paid) recovered (118) 12,058 4,876
Cash dividends received from subsidiaries 50,000 26,000 44,000
Other, net 7,703 (10,012) 359
Net cash provided by operating activities 43,637 14,531 35,630
Cash flows - investing activities      
Net (increase) decrease in investments (10,762) 4,240 (1,641)
Capital contributions to subsidiaries     (24,000)
Net cash provided by (used in) investing activities (10,762) 4,240 (25,641)
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
Net cash used in financing activities (32,855) (18,910) (10,121)
Net increase (decrease) in cash 20 (139) (132)
Cash at beginning of period 129 268 400
Cash at end of period $ 149 $ 129 $ 268