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Shareholders' Equity Cash Dividends Declared Per Common Share (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Disclosure of Cash Dividends Declared and Paid Per Common Share [Abstract] | ||||
| Cash dividends declared and paid per common share | $ 0.48 | $ 0.42 | $ 0.96 | $ 0.84 |