Owners' Equity - Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2015

Class of Stock [Line Items]

Preferred Unit Distributions [Table Text Block]

The Company paid the following Equity Preferred Unit distributions for the year ended December 31, 2013:

Distributions (in millions)	$1.6
Distribution per unit:
Series E	$1.21
Series F	$1.32
Series G	$1.33

Liberty Property Limited Partnership [Member]

Class of Stock [Line Items]

Preferred Unit Distributions [Table Text Block]

The Operating Partnership paid the following Equity Preferred Unit distributions for the year ended December 31, 2013:

Distributions (in millions)	$1.6
Distribution per unit:
Series E	$1.21
Series F	$1.32
Series G	$1.33