Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2010
Selected quarterly financial data
Total Revenues	$ 55,079	$ 59,568	$ 57,945	$ 55,467	$ 49,135	$ 49,969	$ 53,134	$ 52,800	$ 51,677	$ 53,123	$ 99,104	$ 104,800	$ 228,059	$ 205,038	$ 210,734	$ 223,173
Income (loss) before income taxes	175	3,378	(4,470)	(8,128)	(25,716)	(3,573)	(53,215)	(1,910)	(1,969)	512	(29,289)	(1,457)	(9,045)	(84,414)	(56,582)	7,481
Net Income (Loss)	$ 96	$ 3,279	$ (4,208)	$ (8,207)	$ (25,749)	$ (3,688)	$ (53,474)	$ (1,608)	$ (2,090)	$ 392	$ (29,437)	$ (1,698)	$ (9,040)	$ (84,519)	$ (56,780)	$ 7,040
Basic and diluted net income (loss) per share	$ 0.00	$ 0.08	$ (0.10)	$ (0.20)	$ (0.55)	$ (0.08)	$ (1.11)	$ (0.03)	$ (0.04)	$ 0.01	$ (0.62)	$ (0.04)	$ (0.22)	$ (1.76)