Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The sum of the quarterly income (loss) per share amounts may not equal the annual income per share amounts due primarily to changes in the number of common shares outstanding from quarter to quarter (in thousands, except per share data):

	Three Months Ended
	March 31,			June 30,			September 30,		December 31,
	2012			2012			2012		2012
Total revenues	$	32,877		$	35,389		$	34,486	$	34,627
Operating income		2,702			2,985			5,250		5,618
Net income (loss)		(980	)		460			9,050		2,268
Net income (loss) attributable to common stockholders		(1,635	)		(676	)		7,839		1,110
Net income (loss) attributable to common stockholders per share - basic and diluted	$	(0.05	)	$	(0.02	)	$	0.20	$	0.03

	Three Months Ended
	March 31,			June 30,			September 30,		December 31,
	2011			2011			2011		2011
Total revenues	$	23,874		$	24,890		$	20,396	$	25,632
Operating income		729			600			2,254		3,672
Net income (loss)		(474	)		(641	)		414		4,483
Net income (loss) attributable to common stockholders		(472	)		(638	)		408		4,433
Net income (loss) attributable to common stockholders per share - basic and diluted	$	(0.02	)	$	(0.02	)	$	0.01	$	0.14