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Noncontrolling Interest (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Noncontrolling Interest [Abstract]    
Common stock, conversion term 6 months  
Common stock, conversion basis (in shares) 1  
EQC Operating Trust    
Noncontrolling Interest [Line Items]    
Noncontrolling interest, ownership percentage by parent 99.96% 99.97%