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Earnings per Share ("EPS"): (Details 2)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Convertible non-participating preferred units
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from Diluted EPS (in shares) 184,304 184,304 184,304 197,183
Partnership unit
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from Diluted EPS (in shares) 10,110,716 9,621,313 10,072,321 9,920,197