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Quarterly Results of Operations (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 31, 2012 stockholder
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,736,794 | $ 2,389,815 | $ 2,590,642 | $ 2,601,102 | $ 2,723,102 | $ 2,449,081 | $ 2,375,753 | $ 2,292,975 | $ 10,318,353 | $ 9,840,911 | $ 8,829,538 |
Total benefits and expenses | 2,507,304 | 2,188,120 | 2,665,400 | 2,322,275 | 2,402,013 | 2,247,602 | 2,159,861 | 2,112,212 | 9,683,099 | 8,921,688 | 8,065,967 |
Income before income taxes | 229,490 | 201,695 | (74,758) | 278,827 | 321,089 | 201,479 | 215,892 | 180,763 | 635,254 | 919,223 | 763,571 |
Net Income | $ 144,959 | $ 137,955 | $ (49,612) | $ 185,535 | $ 222,989 | $ 144,475 | $ 141,111 | $ 123,318 | $ 418,837 | $ 631,893 | $ 546,045 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic (in dollars per share) | $ 2.05 | $ 1.95 | $ (0.69) | $ 2.51 | $ 3.02 | $ 1.96 | $ 1.91 | $ 1.68 | $ 5.82 | $ 8.57 | $ 7.42 |
Earnings Per Share, Diluted (in dollars per share) | $ 2.03 | $ 1.93 | $ (0.69) | $ 2.49 | $ 3.00 | $ 1.95 | $ 1.91 | $ 1.67 | $ 5.78 | $ 8.52 | $ 7.37 |
Dividends declared per share | $ 0.30 | $ 0.30 | $ 0.24 | $ 0.24 | $ 0.24 | $ 0.24 | $ 0.18 | $ 0.18 | $ 1.08 | $ 0.84 | $ 0.60 |
Common Stock Value [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Price Per Share | $ 77.41 | $ 66.99 | $ 69.11 | $ 59.67 | $ 53.52 | $ 57.87 | $ 53.21 | $ 59.47 | $ 77.41 | $ 53.52 |  |
Common Stock Value High | $ 77.55 | $ 73.32 | $ 69.28 | $ 61.86 | $ 60.20 | $ 60.69 | $ 59.87 | $ 59.97 | $ 77.55 | $ 60.20 |  |
Common Stock Value Low | $ 66.99 | $ 63.95 | $ 57.14 | $ 54.33 | $ 48.36 | $ 52.75 | $ 48.80 | $ 51.19 | $ 66.99 | $ 48.36 |  |
Common stock shares outstanding | 70,768,218 | 70,543,000 | 70,968,000 | 73,301,000 | 73,927,331 | 73,852,000 | 73,722,000 | 73,712,000 | 70,768,218 | 73,927,331 |  |
Common Stockholders Of Record |  |  |  |  |  |  |  |  |  |  |  | 70,615

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