Quarterly report pursuant to Section 13 or 15(d)

Capital Stock (Details)

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Capital Stock (Details) (USD $)
0 Months Ended
Jun. 01, 2012
Apr. 29, 2012
Mar. 13, 2012
Mar. 01, 2012
Feb. 15, 2012
Dec. 01, 2011
Nov. 18, 2011
Sep. 01, 2011
Aug. 15, 2011
Jul. 12, 2011
Jun. 01, 2011
Apr. 29, 2011
Mar. 01, 2011
Feb. 15, 2011
Capital Stock [Abstract]                            
Dividend payable, per share     $ 0.625             $ 0.28 $ 0.14   $ 0.14  
Common share dividends date paid Jun. 01, 2012     Mar. 01, 2012   Dec. 01, 2011   Sep. 01, 2011     Jun. 01, 2011   Mar. 01, 2011  
Common share dividends date of record   Apr. 29, 2012     Feb. 15, 2012   Nov. 18, 2011   Aug. 15, 2011     Apr. 29, 2011   Feb. 15, 2011
Percentage increase in dividends payable     123.00%             100.00%