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Earnings Per Share Treasury Share Buyback (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Share [Abstract] |  |  |
Shares which exclude consideration of stock options in calculation of diluted shares outstanding | 1,866,720 | 865,844 | 226,897
Treasury stock, shares |  | 10,000,000 |
Treasury stock, value | $ 0 | $ (101,697) |
Weighted average number diluted shares outstanding adjustment | 5,600,000 |  |

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