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Consolidated Statements of Stockholders' Equity (Parenthetical) (Unaudited) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statements of Stockholders' Equity [Abstract] |  |  |
Dividend common stock, Per share | $ 0.28 | $ 0.24 | $ 0.20
Dividend preferred stock, Per share | $ 0.65 | $ 0.65 | $ 0.64

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- Definition Dividend common stock per share amount. + References No definition available. + Details
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- Definition Dividend preferred stock per share amount + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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