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Earnings per Share ("EPS"): (Details 2)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 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) 184,304 184,304 184,304 184,304
Partnership unit
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from Diluted EPS (in shares) 10,113,486 9,938,795 10,052,805 10,072,120