Earnings Per Share (Tables)

3 Months Ended

Sep. 30, 2012

Earnings Per Share (Tables) [Abstract]

Computation of basic and diluted earnings per share

		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2012		2011		2012		2011
Numerator for basic and diluted earnings
	per share - net income (loss) attributable
	to common stockholders	$	37,269	$	36,607	$	131,308	$	129,826
Denominator for basic earnings per
	share - weighted average shares		224,391		177,272		212,592		169,636
Effect of dilutive securities:
	Employee stock options		238		172		240		180
	Non-vested restricted shares		301		258		293		241
	Convertible senior unsecured notes		1,328		147		950		244
Dilutive potential common shares			1,867		577		1,483		665
Denominator for diluted earnings per
	share - adjusted weighted average shares		226,258		177,849		214,075		170,301
Basic earnings per share		$	0.17	$	0.21	$	0.62	$	0.77
Diluted earnings per share		$	0.16	$	0.21	$	0.61	$	0.76