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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Par value (USD per share) $ 0.001 $ 0.001
Common shares authorized (in shares) 283,987,000 283,987,000
Common shares issued (in shares) 147,899,354 147,450,691
Common shares outstanding (in shares) 147,899,354 147,450,691
Common units outstanding (in shares) 3,520,205 3,520,205
Redeemable Preferred Stock    
Redeemable stock, preferred units outstanding (in shares) 301,483 301,483
Liberty Property Limited Partnership    
General Partners' Capital Account, Units Outstanding 147,899,354 147,450,691
Common units outstanding (in shares) 3,520,205 3,520,205
Liberty Property Limited Partnership | Redeemable Preferred Stock    
Redeemable stock, preferred units outstanding (in shares) 301,483 301,483