Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share (Tables) [Abstract]

Computation of basic and diluted earnings per share

		Three Months Ended
		March 31,
		2015		2014
Numerator for basic and diluted earnings
	per share - net income (loss) attributable
	to common stockholders	$	190,799	$	50,022
Denominator for basic earnings per
	share - weighted average shares		336,754		289,606
Effect of dilutive securities:
	Employee stock options		200		148
	Non-vested restricted shares		416		540
	Convertible senior unsecured notes		442		623
Dilutive potential common shares			1,058		1,311
Denominator for diluted earnings per
	share - adjusted weighted average shares		337,812		290,917
Basic earnings per share		$	0.57	$	0.17
Diluted earnings per share		$	0.56	$	0.17