Quarterly report pursuant to Section 13 or 15(d)

Per Share Information (Details Textual)

v2.4.0.6
Per Share Information (Details Textual)
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2012
Exchangeable Shares [Member]
Dec. 31, 2011
Exchangeable Shares [Member]
Oct. 25, 2010
Exchangeable Shares [Member]
Per Share Information (Textual) [Abstract]          
Common stock, shares issued 220,009,156 217,479,462 3,909,110 3,909,110 3,909,110
Per Share Information (Additional Textual) [Abstract]          
Stock options excluded from the computation of diluted earnings per share 100,000