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Quarterly Financial Information (Details) (USD $) | 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 | Jan. 31, 2012
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 2,723,102,000 | $ 2,449,081,000 | $ 2,375,753,000 | $ 2,292,975,000 | $ 2,348,219,000 | $ 1,994,907,000 | $ 2,203,977,000 | $ 2,282,435,000 | $ 9,840,911,000 | $ 8,829,538,000 | $ 8,261,730,000 |
Total benefits and expenses | 2,402,013,000 | 2,247,602,000 | 2,159,861,000 | 2,112,212,000 | 2,154,968,000 | 1,838,511,000 | 2,016,808,000 | 2,055,680,000 | 8,921,688,000 | 8,065,967,000 | 7,455,549,000 |
Income Loss From Continuing Operations Before Provision For Income Tax | 321,089,000 | 201,479,000 | 215,892,000 | 180,763,000 | 193,251,000 | 156,396,000 | 187,169,000 | 226,755,000 | 919,223,000 | 763,571,000 | 806,181,000 |
Net income | $ 222,989,000 | $ 144,475,000 | $ 141,111,000 | $ 123,318,000 | $ 138,579,000 | $ 134,602,000 | $ 123,944,000 | $ 148,920,000 | $ 631,893,000 | $ 546,045,000 | $ 535,742,000 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic | $ 3.02 | $ 1.96 | $ 1.91 | $ 1.68 | $ 1.89 | $ 1.82 | $ 1.68 | $ 2.03 | $ 8.57 | $ 7.42 | $ 7.32 |
Earnings Per Share, Diluted | $ 3.00 | $ 1.95 | $ 1.91 | $ 1.67 | $ 1.88 | $ 1.81 | $ 1.66 | $ 2.02 | $ 8.52 | $ 7.37 | $ 7.17 |
Dividends declared per share | $ 0.24 | $ 0.24 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.12 | $ 0.12 | $ 0.84 | $ 0.60 | $ 0.48 |
Common Stock Value [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Price Per Share | $ 53.52 | $ 57.87 | $ 53.21 | $ 59.47 | $ 52.25 | $ 45.95 | $ 60.86 | $ 62.78 | $ 53.52 | $ 52.25 |  |
Common Stock Value High | $ 60.20 | $ 60.69 | $ 59.87 | $ 59.97 | $ 55.51 | $ 64.32 | $ 63.73 | $ 63.14 | $ 60.20 | $ 55.51 |  |
Common Stock Value Low | $ 48.36 | $ 52.75 | $ 48.80 | $ 51.19 | $ 44.67 | $ 44.51 | $ 58.40 | $ 53.92 | $ 48.36 | $ 44.67 |  |
Common stock shares outstanding | 73,927,331 | 73,852,000 | 73,722,000 | 73,712,000 | 73,363,195 | 73,267,000 | 74,076,000 | 73,797,000 | 73,927,331 | 73,363,195 |  |
Common Stockholders Of Record |  |  |  |  |  |  |  |  |  |  |  | 76,603

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