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Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
Years Ended December 31, |  |  |  |  |  |  |  |
(in thousands, except per share data) |  |  |  |  |  |  |  |
2013 |  | First |  | Second |  | Third |  | Fourth
Total Revenues |  | $ | 2,601,102 |  |  | $ | 2,590,642 |  |  | $ | 2,389,815 |  |  | $ | 2,736,794 |
Total benefits and expenses |  | 2,322,275 |  |  | 2,665,400 |  |  | 2,188,120 |  |  | 2,507,304 |
Income before income taxes |  | 278,827 |  |  | (74,758 | ) |  | 201,695 |  |  | 229,490 |
Net Income |  | 185,535 |  |  | (49,612 | ) |  | 137,955 |  |  | 144,959 |
Earnings Per Share: |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 2.51 |  |  | $ | (0.69 | ) |  | $ | 1.95 |  |  | $ | 2.05 |
Diluted earnings per share |  | 2.49 |  |  | (0.69 | ) |  | 1.93 |  |  | 2.03 |
Dividends declared per share |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.30 |  |  | $ | 0.30 |
Market price of common stock |  |  |  |  |  |  |  |
Quarter end |  | $ | 59.67 |  |  | $ | 69.11 |  |  | $ | 66.99 |  |  | $ | 77.41 |
Common stock price, high |  | 61.86 |  |  | 69.28 |  |  | 73.32 |  |  | 77.55 |
Common stock price, low |  | 54.33 |  |  | 57.14 |  |  | 63.95 |  |  | 66.99 |
Total outstanding common shares - end of period |  | 73,301 |  |  | 70,968 |  |  | 70,543 |  |  | 70,768 |
2012 |  | First |  | Second |  | Third |  | Fourth
Total Revenues |  | $ | 2,292,975 |  |  | $ | 2,375,753 |  |  | $ | 2,449,081 |  |  | $ | 2,723,102 |
Total benefits and expenses |  | 2,112,212 |  |  | 2,159,861 |  |  | 2,247,602 |  |  | 2,402,013 |
Income before income taxes |  | 180,763 |  |  | 215,892 |  |  | 201,479 |  |  | 321,089 |
Net Income |  | 123,318 |  |  | 141,111 |  |  | 144,475 |  |  | 222,989 |
Earnings Per Share: |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 1.68 |  |  | $ | 1.91 |  |  | $ | 1.96 |  |  | $ | 3.02 |
Diluted earnings per share |  | 1.67 |  |  | 1.91 |  |  | 1.95 |  |  | 3.00 |
Dividends declared per share |  | $ | 0.18 |  |  | $ | 0.18 |  |  | $ | 0.24 |  |  | $ | 0.24 |
Market price of common stock |  |  |  |  |  |  |  |
Quarter end |  | $ | 59.47 |  |  | $ | 53.21 |  |  | $ | 57.87 |  |  | $ | 53.52 |
Common stock price, high |  | 59.97 |  |  | 59.87 |  |  | 60.69 |  |  | 60.20 |
Common stock price, low |  | 51.19 |  |  | 48.80 |  |  | 52.75 |  |  | 48.36 |
Total outstanding common shares—end of period |  | 73,712 |  |  | 73,722 |  |  | 73,852 |  |  | 73,927 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=25249566&loc=d3e1280-108306 + Details
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