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Income per Common Share of the Trust Income per Common Share of the Trust, Anti-dilutive (Details) (Stock Option [Member])
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Option [Member]
       
Antidilutive Options Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Options Excluded from Computation of Earnings Per Share 1,183,000 994,000 850,000 959,000