Redeemable Preferred Stock (Details Textual)	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Redeemable Preferred Stock (Textual) [Abstract]
Preferred stock dividend rate, percentage	7.00%	7.00%

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