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Special Cash Dividend (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2013 | May 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 21, 2013
Special Cash Dividend [Abstract] |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 5.00 | $ 6.00 | $ 5.00 | $ 6.00 | $ 0 |
Cash dividends paid |  |  | $ 340,772 | $ 404,332 |  |
Dividends declared but unpaid |  |  | 1,300 |  |  |
Special cash dividends declared but unpaid |  |  | 1,172 |  |  |
Retained earnings as of the dividend declaration date |  |  |  |  |  | $ 4,934

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