Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity Shareholders' Equity Dividends on Commons Stock (Table) (Details)

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Shareholders' Equity Shareholders' Equity Dividends on Commons Stock (Table) (Details) (USD $)
 1 Months Ended 0 Months Ended 3 Months Ended
Nov. 30, 2011
Aug. 31, 2011
May 31, 2011
Oct. 24, 2012
Dividend Declared [Member]
Jul. 11, 2012
Dividend Declared [Member]
Apr. 11, 2012
Dividend Declared [Member]
Jan. 11, 2012
Dividend Declared [Member]
Mar. 31, 2013
Dividend Declared [Member]
Dividends Payable [Line Items]                
Common Stock, Dividends, Per Share, Declared $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01