Quarterly Operating Results (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Operating Results [Abstract]

Unaudited consolidated quarterly operating data

	Year Ended December 31, 2011
	First Quarter			Second Quarter		Third Quarter		Fourth Quarter
Total revenues	$	42,665		$	73,110	$	87,803	$	84,409
Net income (loss)		(3,044	)		4,299		5,838		8,106
Net income (loss) attributable to the Company		(3,044	)		4,214		5,724		7,962
Net income (loss) attributable to common shareholders		(3,591	)		1,753		2,825		3,456
Net income (loss) per share available to common shareholders, basic and diluted	$	(0.09	)	$	0.03	$	0.05	$	0.07

	Year Ended December 31, 2010
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Total revenues	$	—		$	2,216		$	21,637		$	33,908
Net income (loss) attributable to the Company		(599	)		(3,814	)		(308	)		(1,921	)
Net income (loss) attributable to common shareholders		(599	)		(3,814	)		(308	)		(1,921	)
Net income (loss) per share available to common shareholders, basic and diluted	$	(0.03	)	$	(0.19	)	$	(0.01	)	$	(0.05	)