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Common Stock and Earnings per Share (Details Textual) | 12 Months Ended
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Dec. 31, 2012
Preferred Stock, Dividend Rate, Percentage | 10.00%

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration