Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share (Tables) [Abstract]

Computation of basic and diluted earnings per share

		Year Ended December 31,
		2015		2014		2013
Numerator for basic and diluted earnings
	per share - net income attributable to
	common stockholders	$	818,344	$	446,745	$	78,714
Denominator for basic earnings per
	share: weighted-average shares		348,240		306,272		276,929
Effect of dilutive securities:
	Employee stock options		143		188		226
	Non-vested restricted shares		535		500		457
	Redeemable shares		310		-		-
	Convertible senior unsecured notes		196		787		1,149
Dilutive potential common shares			1,184		1,475		1,832
Denominator for diluted earnings per
	share: adjusted-weighted average shares		349,424		307,747		278,761
Basic earnings per share		$	2.35	$	1.46	$	0.28
Diluted earnings per share		$	2.34	$	1.45	$	0.28