Earnings Per Share (Tables)

3 Months Ended

Jun. 30, 2011

Earnings Per Share (Tables) [Abstract]

Computation of basic and diluted earnings per share

		Three Months Ended				Six Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
Numerator for basic and diluted earnings
	per share - net income (loss) attributable
	to common stockholders	$	54,735	$	69,847	$	94,037	$	93,219
Denominator for basic earnings per
	share - weighted average shares		213,498		176,445		206,612		165,755
Effect of dilutive securities:
	Employee stock options		261		178		242		184
	Non-vested restricted shares		299		249		290		232
	Convertible senior unsecured notes		1,080		616		1,093		287
Dilutive potential common shares			1,640		1,043		1,625		703
Denominator for diluted earnings per
	share - adjusted weighted average shares		215,138		177,488		208,237		166,458
Basic earnings per share		$	0.26	$	0.40	$	0.46	$	0.56
Diluted earnings per share		$	0.25	$	0.39	$	0.45	$	0.56