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Parent Corporation Statements of Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues:                      
Net investment income earned $ 34,593 $ 30,650 $ 34,006 $ 32,628 $ 28,839 $ 35,786 $ 39,345 $ 43,473 $ 131,877 $ 147,443 $ 145,708
Other income                 9,118 8,479 9,398
Total revenues                 1,734,102 1,597,475 1,564,621
Expenses:                      
Interest expense                 18,872 18,259 18,616
Other expenses                 30,462 26,425 23,886
Total expenses                 1,696,467 1,586,075 1,480,472
Federal income tax benefit:                      
Current                 5,647 (228) 5,323
Deferred                 (5,975) (11,055) 8,080
Total federal income tax (benefit) expense                 (328) (11,283) 13,403
Net income from continuing operations 1,308 18,274 288 18,093 18,034 (17,318) 1,467 20,500 37,963 22,683 70,746
Loss on disposal of discontinued operations                 0 (650) (3,780)
Net income 1,308 18,274 288 18,093 18,034 (17,968) 1,467 20,500 37,963 22,033 66,966
Parent Company [Member]
                      
Revenues:                      
Dividends from subsidiaries                 196,091 63,025 48,010
Net investment income earned                 495 231 130
Other income                 464 362 107
Total revenues                 197,050 63,618 48,247
Expenses:                      
Interest expense                 20,711 20,203 20,615
Other expenses                 20,632 16,832 16,039
Total expenses                 41,343 37,035 36,654
Income from continuing operations before federal income tax                 155,707 26,583 11,593
Federal income tax benefit:                      
Current                 (4,602) (12,785) (11,645)
Deferred                 (9,347) 490 (848)
Total federal income tax (benefit) expense                 (13,949) (12,295) (12,493)
Net income from continuing operations before equity in undistributed income of subsidiaries                 169,656 38,878 24,086
Equity in undistributed income of continuing subsidiaries, net of tax                 0 0 46,660
Dividends in excess of continuing subsidiaries' current year earnings                 (131,693) (16,195) 0
Net income from continuing operations                 37,963 22,683 70,746
Loss on disposal of discontinued operations                 0 (650) (3,780)
Net income                 $ 37,963 $ 22,033 $ 66,966