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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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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 declared | |||||||||||
| Common stock, dividend per share | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.23 | $ 0.23 | $ 0.23 | $ 0.23 | $ 0.2 | $ 1.01 | $ 0.89 | $ 0.8 |