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

The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration