Business Combinations (Tables)

6 Months Ended

Jun. 30, 2012

Business Combinations [Abstract]

Schedule of pro forma information for business combinations

	Three Months Ended			Six Months Ended
	June 30,			June 30,
(amounts in thousands, except per share amounts)	2011			2011
Total revenues	$	505,023		$	992,653
Net loss available for stockholders	$	(59,172	)	$	(110,512	)
Net loss per share available for common stockholders - basic	$	(0.13	)	$	(0.24	)
Net loss per share available for common stockholders - diluted	$	(0.13	)	$	(0.24	)