Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Common Shares    
Number of common shares for each converted common unit (in shares) 34,550  
Dividends declared per common share (in dollars per share) $ 0.275 $ 0.4125