Income per Common Share of the Trust (Tables)

3 Months Ended

Mar. 31, 2012

Income per Common Share of the Trust [Abstract]

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

	For the Three Months Ended					For the Three Months Ended
	March 31, 2012					March 31, 2011
	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	$	33,301	115,972	$	0.29	$	24,820	114,013	$	0.21
Dilutive shares for long-term compensation plans	—		771			—		753
Diluted income from continuing operations
Income from continuing operations net of noncontrolling interest	33,301		116,743	$	0.29	24,820		114,766	$	0.21
Basic income from discontinued operations
Discontinued operations net of noncontrolling interest	3,788		115,972	$	0.03	4,089		114,013	$	0.04
Dilutive shares for long-term compensation plans	—		771			—		753
Diluted income from discontinued operations
Discontinued operations net of noncontrolling interest	3,788		116,743	$	0.03	4,089		114,766	$	0.04
Basic income per common share
Net income available to common shareholders	37,089		115,972	$	0.32	28,909		114,013	$	0.25
Dilutive shares for long-term compensation plans	—		771			—		753
Diluted income per common share
Net income available to common shareholders	$	37,089	116,743	$	0.32	$	28,909	114,766	$	0.25