Income per Common Share of the Trust (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

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