Summary of Quarterly Results (Unaudited)

12 Months Ended

Dec. 31, 2014

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
	2014
		December 31	$	51,286	$	18,161	$	3.55	$	3.55
		September 30		50,077		17,692		3.46		3.46
		June 30		49,983		16,828		3.29		3.29
		March 31		49,468		15,244		2.98		2.98
	2013
		December 31	$	50,496	$	15,790	$	3.09	$	3.09
		September 30		49,886		13,824		2.71		2.71
		June 30		47,302		13,139		2.57		2.57
		March 31		48,775		14,162		2.77		2.77
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(1)	The total for the year may differ from the sum of the quarters as a result of weighting.