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Consolidated Balance Sheets (Parentheticals) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Limited Partners' common units outstanding 3,513,049 3,520,205
Common shares of beneficial interest, par value per share $ 0.001 $ 0.001
Common shares of beneficial interest, shares authorized 283,987,000 283,987,000
Common shares of beneficial interest, shares issued 148,297,283 147,899,354
Common shares of beneficial interest, shares outstanding   147,899,354
Liberty Property Limited Partnership    
Limited Partners' common units outstanding 3,513,049 3,520,205
Common shares of beneficial interest, shares outstanding 148,297,283 147,899,354
Series I-2    
Noncontrolling interest - operating partnership, preferred units outstanding 213,483 301,483
Series I-2 | Liberty Property Limited Partnership    
Noncontrolling interest - operating partnership, preferred units outstanding 213,483 301,483