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Basis Of Presentation (Details) (USD $) | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Dividend Declared [Member] | Jun. 30, 2013 Dividend Declared [Member] | Jun. 30, 2013 Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |  |  |
Subsequent Event, Date Evaluated, Description | The Company evaluated events and transactions that occurred after the balance sheet date but before financial statements were issued |  |  |  |
Dividends payable, date declared |  |  |  |  | Jul. 19, 2013
Quarterly dividends per share | $ 0.88 | $ 1.68 | $ 0.49 | $ 0.44 |

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