Summary of Quarterly Results (Unaudited)

12 Months Ended

Dec. 31, 2012

Summary of Quarterly Results [Abstract]

Summary of Quarterly Results (Unaudited) [Text Block]

13.       SUMMARY OF QUARTERLY RESULTS (UNAUDITED)

					Net Income
					Attributable to			Net Income Per
					Common			Common Share(1)
	(Amounts in thousands, except per share amounts)		Revenues		Stockholders			Basic		Diluted
	2012
		December 31	$	48,491	$	617,157	(2)	$	120.82	$	120.82
		September 30		48,642		18,856			3.69		3.69
		June 30		46,878		18,892			3.70		3.70
		March 31		47,301		19,482			3.81		3.81
	2011
		December 31	$	46,558	$	20,634		$	4.04	$	4.04
		September 30		46,949		20,425			4.00		4.00
		June 30		45,377		20,157			3.95		3.95
		March 31		46,362		18,207			3.57		3.57
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(1)	The total for the year may differ from the sum of the quarters as a result of weighting.
(2)	Includes a $599,628 net gain on sale of real estate.