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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

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