Owners' Equity - Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2013

Class of Stock [Line Items]

Preferred Unit Distributions [Table Text Block]

The Company paid the following Equity Preferred Unit distributions for the years ended December 31:

	2013	2012	2011
Distributions (in millions)	$1.6	$9.9	$21.0
Distribution per unit:
Series B	—	$0.45	$1.86
Series E	$1.21	$3.50	$3.50
Series F	$1.32	$1.43	$3.33
Series G	$1.33	$3.35	$3.35
Series H	—	$0.77	$1.85

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 years ended December 31:

	2013	2012	2011
Distributions (in millions)	$1.6	$9.9	$21.0
Distribution per unit:
Series B	—	$0.45	$1.86
Series E	$1.21	$3.50	$3.50
Series F	$1.32	$1.43	$3.33
Series G	$1.33	$3.35	$3.35
Series H	—	$0.77	$1.85