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Consolidated Statements of Changes in Common Shareholders' Equity (Parentheticals) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Cash dividends [Abstract] | |||
| Cash dividends declared per share | $ 1.91 | $ 1.48 | $ 1.245 |