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Shareholders' Equity - Cash Dividends Declared Per Common Share (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Disclosure of Cash Dividends Declared and Paid Per Common Share [Abstract] | ||||
| Cash dividends declared and paid per common share | $ 0.42 | $ 0.37 | $ 1.26 | $ 1.11 |