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Earnings Per Share / Unit (EPS / EPU) - Additional Information (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested Restricted Stock / Unit Awards 1,000,819 1,112,828  
Restricted Stock/Unit Awards | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested Restricted Stock / Unit Awards 405,436 408,248 406,855