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Subsequent Events (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Oct. 31, 2013 Dividend declared, July 2013
Subsequent Events |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.125 | $ 0.25 | $ 0.125 | $ 0.250 | $ 0.375 | $ 0.125
Cash dividend declared |  | $ 12,106 |  | $ 12,083 | $ 18,119 | $ 6,000

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