Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Selected Quarterly Financial Data [Abstract]

Selected quarterly financial data

	Total Revenues		Income (Loss) before Income Taxes			Net Income (Loss)			Basic and Diluted Net Income (Loss) per Share
Year Ended December 31, 2012:
December 31, 2012	$	55,079	$	175		$	96		$	0.00
September 30, 2012		59,568		3,378			3,279			0.08
June 30, 2012		57,945		(4,470	)		(4,208	)		(0.10	)
March 31, 2012		55,467		(8,128	)		(8,207	)		(0.20	)
Six Months Ended December 31, 2011:
December 31, 2011	$	49,135	$	(25,716	)	$	(25,749	)	$	(0.55	)
September 30, 2011		49,969		(3,573	)		(3,688	)		(0.08	)
Year Ended June 30, 2011:
June 30, 2011	$	53,134	$	(53,215	)	$	(53,474	)	$	(1.11	)
March 31, 2011		52,800		(1,910	)		(1,608	)		(0.03	)
December 31, 2010		51,677		(1,969	)		(2,090	)		(0.04	)
September 30, 2010		53,123		512			392			0.01