Income per Common Unit of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Unit, Basic and Diluted [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):

	2015					2014
	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share		Income (Numerator)		Weighted Average Shares (Denominator)	Per Share
Income from continuing operations net of noncontrolling interest - basic	$	238,039	148,243	$	1.61	$	170,471	147,216	$	1.16
Dilutive shares for long-term compensation plans	—		600			—		670
Income from continuing operations net of noncontrolling interest - diluted	$	238,039	148,843	$	1.60	$	170,471	147,886	$	1.15
Discontinued operations net of noncontrolling interest - basic	$	—	148,243	$	—	$	47,439	147,216	$	0.32
Dilutive shares for long-term compensation plans	—		600			—		670
Discontinued operations net of noncontrolling interest - diluted	$	—	148,843	$	—	$	47,439	147,886	$	0.32
Net income available to common shareholders - basic	$	238,039	148,243	$	1.61	$	217,910	147,216	$	1.48
Dilutive shares for long-term compensation plans	—		600			—		670
Net income available to common shareholders - diluted	$	238,039	148,843	$	1.60	$	217,910	147,886	$	1.47

	2013
	Income (Numerator)		Weighted Average Shares (Denominator)	Per Share
Income from continuing operations net of noncontrolling interest - basic	$	91,274	130,180	$	0.70
Dilutive shares for long-term compensation plans	—		729
Income from continuing operations net of noncontrolling interest - diluted	$	91,274	130,909	$	0.70
Discontinued operations net of noncontrolling interest - basic	$	118,464	130,180	$	0.91
Dilutive shares for long-term compensation plans	—		729
Discontinued operations net of noncontrolling interest - diluted	$	118,464	130,909	$	0.90
Net income available to common shareholders - basic	$	209,738	130,180	$	1.61
Dilutive shares for long-term compensation plans	—		729
Net income available to common shareholders - diluted	$	209,738	130,909	$	1.60

Liberty Property Limited Partnership [Member]

Earnings Per Unit, Basic and Diluted [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):

	2015						2014
	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	$	244,197					$	175,035
Less: Preferred unit distributions	(472		)				(472		)
Income from continuing operations available to common unitholders - basic	$	243,725		151,783	$	1.61	$	174,563		150,770	$	1.16
Dilutive units for long-term compensation plans	—			600			—			670
Income from continuing operations available to common unitholders - diluted	$	243,725		152,383	$	1.60	$	174,563		151,440	$	1.15
Income from discontinued operations - basic	$	—		151,783	$	—	$	48,581		150,770	$	0.32
Dilutive units for long-term compensation plans	—			600			—			670
Income from discontinued operations - diluted	$	—		152,383	$	—	$	48,581		151,440	$	0.32
Income available to common unitholders - basic	$	243,725		151,783	$	1.61	$	223,144		150,770	$	1.48
Dilutive units for long-term compensation plans	—			600			—			670
Income available to common unitholders - diluted	$	243,725		152,383	$	1.60	$	223,144		151,440	$	1.47

	2013
	Income (Numerator)			Weighted Average Units (Denominator)	Per Unit
Income from continuing operations net of noncontrolling interest - consolidated joint ventures	$	97,102
Less: Preferred unit distributions	(2,119		)
Excess of preferred unit redemption over carrying amount	(1,236		)
Income from continuing operations available to common unitholders - basic	$	93,747		133,858	$	0.70
Dilutive units for long-term compensation plans	—			729
Income from continuing operations available to common unitholders - diluted	$	93,747		134,587	$	0.70
Income from discontinued operations - basic	$	121,839		133,858	$	0.91
Dilutive units for long-term compensation plans	—			729
Income from discontinued operations - diluted	$	121,839		134,587	$	0.90
Income available to common unitholders - basic	$	215,586		133,858	$	1.61
Dilutive units for long-term compensation plans	—			729
Income available to common unitholders - diluted	$	215,586		134,587	$	1.60