Unaudited Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2011

Unaudited Quarterly Results [Abstract]

Summarized Quarterly Financial Data

Summarized quarterly financial data for the years ended December 31, 2011 and 2010 are set forth in the following tables.

	First Quarter Ended March 31, 2011	Second Quarter Ended June 30, 2011	Third Quarter Ended September 30, 2011	Fourth Quarter Ended December 31, 2011
	(Unaudited)
Revenues	$112,204	$107,810	$102,833	$122,977
Net loss	(43,447)	(62,505)	(62,365)	(53,443)
Net loss per share, basic and diluted:	$(0.49)	$(0.69)	$(0.68)	$(0.58)

	First Quarter Ended March 31, 2010	Second Quarter Ended June 30, 2010	Third Quarter Ended September 30, 2010	Fourth Quarter Ended December 31, 2010
	(Unaudited)
Revenues	$103,534	$115,886	$105,979	$133,675
Net loss	(30,522)	(25,474)	(33,875)	(14,597)
Net loss per share, basic and diluted:	$(0.38)	$(0.31)	$(0.41)	$(0.17)