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Earnings per Share ("EPS"): (Details 2)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Convertible non-participating preferred units
       
Antidilutive securities        
Antidilutive securities (in shares) 184,304 208,640 197,183 208,640
Stock appreciation rights ("SARs")
       
Antidilutive securities        
Antidilutive securities (in shares)   1,191,854   1,209,978
Stock options
       
Antidilutive securities        
Antidilutive securities (in shares)   94,919   119,712
Warrants
       
Antidilutive securities        
Antidilutive securities (in shares)   935,358   935,358
Partnership unit
       
Antidilutive securities        
Antidilutive securities (in shares) 10,769,552 11,055,013 11,069,129 11,465,479