Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net gain on property dispositions included in discontinued operation	$ 7,625	$ 2,981	$ 49,338	$ 4,045
Liberty Property Limited Partnership [Member]
Net gain on property dispositions included in discontinued operation	$ 7,625	$ 2,981	$ 49,338	$ 4,045