Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share (Tables) [Abstract]

Computation of basic and diluted earnings per share

		Year Ended December 31,
		2013		2012		2011
Numerator for basic and diluted earnings
	per share - net income attributable to
	common stockholders	$	78,714	$	221,884	$	157,108
Denominator for basic earnings per
	share: weighted-average shares		276,929		224,343		173,741
Effect of dilutive securities:
	Employee stock options		226		231		176
	Non-vested restricted shares		457		312		246
	Convertible senior unsecured notes		1,149		1,067		238
Dilutive potential common shares			1,832		1,610		660
Denominator for diluted earnings per
	share: adjusted-weighted average shares		278,761		225,953		174,401
Basic earnings per share		$	0.28	$	0.99	$	0.90
Diluted earnings per share		$	0.28	$	0.98	$	0.90