Income per Common Unit of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2013

Income Per Common Unit [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted income per common share of the Trust (in thousands except per share amounts):

	2013					2012
	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share		Income (Numerator)		Weighted Average Shares (Denominator)	Per Share
Basic income from continuing operations
Income from continuing operations net of noncontrolling interest	$	91,274	130,180	$	0.70	$	88,008	116,863	$	0.75
Dilutive shares for long-term compensation plans	—		729			—		831
Diluted income from continuing operations
Income from continuing operations net of noncontrolling interest	91,274		130,909	$	0.70	88,008		117,694	$	0.75
Basic income from discontinued operations
Discontinued operations net of noncontrolling interest	118,464		130,180	$	0.91	49,428		116,863	$	0.43
Dilutive shares for long-term compensation plans	—		729			—		831
Diluted income from discontinued operations
Discontinued operations net of noncontrolling interest	118,464		130,909	$	0.90	49,428		117,694	$	0.42
Basic income per common share
Net income available to common shareholders	209,738		130,180	$	1.61	137,436		116,863	$	1.18
Dilutive shares for long-term compensation plans	—		729			—		831
Diluted income per common share
Net income available to common shareholders	$	209,738	130,909	$	1.60	$	137,436	117,694	$	1.17

	2011
	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share
Basic income from continuing operations
Income from continuing operations net of noncontrolling interest	$	81,392	114,755	$	0.71
Dilutive shares for long-term compensation plans	—		748
Diluted income from continuing operations
Income from continuing operations net of noncontrolling interest	81,392		115,503	$	0.70
Basic income from discontinued operations
Discontinued operations net of noncontrolling interest	102,607		114,755	$	0.89
Dilutive shares for long-term compensation plans	—		748
Diluted income from discontinued operations
Discontinued operations net of noncontrolling interest	102,607		115,503	$	0.89
Basic income per common share
Net income available to common shareholders	183,999		114,755	$	1.60
Dilutive shares for long-term compensation plans	—		748
Diluted income per common share
Net income available to common shareholders	$	183,999	115,503	$	1.59

Liberty Property Limited Partnership [Member]

Income Per Common Unit [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted income per common unit of the Operating Partnership (in thousands, except per unit amounts):

	2013						2012
	Income (Numerator)			Weighted Average Units (Denominator)	Per Unit		Income (Numerator)			Weighted Average Units (Denominator)	Per Unit
Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	97,102					$	97,022
Less: Preferred unit distributions	(2,119		)				(9,902		)
Excess of preferred unit (redemption over carrying amount) carrying amount over redemption	(1,236		)				3,689
Basic income from continuing operations
Income from continuing operations available to common unitholders	93,747			133,858	$	0.70	90,809			120,623	$	0.75
Dilutive units for long-term compensation plans	—			729			—			831
Diluted income from continuing operations
Income from continuing operations available to common unitholders	93,747			134,587	$	0.70	90,809			121,454	$	0.75
Basic income from discontinued operations
Discontinued operations	121,839			133,858	$	0.91	51,004			120,623	$	0.43
Dilutive units for long-term compensation plans	—			729			—			831
Diluted income from discontinued operations
Discontinued operations	121,839			134,587	$	0.90	51,004			121,454	$	0.42
Basic income per common unit
Income available to common unitholders	215,586			133,858	$	1.61	141,813			120,623	$	1.18
Dilutive units for long-term compensation plans	—			729			—			831
Diluted income per common unit
Income available to common unitholders	$	215,586		134,587	$	1.60	$	141,813		121,454	$	1.17

	2011
	Income (Numerator)			Weighted Average Units (Denominator)	Per Unit
Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	105,156
Less: Preferred unit distributions	(21,069		)
Basic income from continuing operations
Income from continuing operations available to common unitholders	84,087			118,624	$	0.71
Dilutive units for long-term compensation plans	—			748
Diluted income from continuing operations
Income from continuing operations available to common unitholders	84,087			119,372	$	0.70
Basic income from discontinued operations
Discontinued operations	106,065			118,624	$	0.89
Dilutive units for long-term compensation plans	—			748
Diluted income from discontinued operations
Discontinued operations	106,065			119,372	$	0.89
Basic income per common unit
Income available to common unitholders	190,152			118,624	$	1.60
Dilutive units for long-term compensation plans	—			748
Diluted income per common unit
Income available to common unitholders	$	190,152		119,372	$	1.59