Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation

Employee Stock-Based Compensation Costs Table

	For the three months ended		For the six months ended
	June 30,		June 30,
	2011	2010	2011	2010
	(in thousands)
Stock-based compensation cost – general and administrative expense	$2,236	$2,136	$4,686	$4,433
Stock-based compensation cost – capitalized	$1,905	$1,689	$3,815	$3,397

Summary of Stock Option Activity, Options Outstanding

		Weighted
		Average
	Number	Exercise
	of Options	Price
Outstanding at December 31, 2010	4,769,122	$16.13
Granted	15,000	40.63
Exercised	(397,640)	8.46
Forfeited or expired	(17,001)	37.46
Outstanding at June 30, 2011	4,369,481	$16.83
Exercisable at June 30, 2011	3,546,494	$12.16

Summary of Restricted Stock Activity and Unvested Shares

		Weighted
		Average
	Number	Grant Date
	of Shares	Fair Value
Unvested shares at December 31, 2010	834,058	$36.24
Granted	1,270	38.58
Vested	(25,818)	39.00
Forfeited	(29,729)	36.49
Unvested shares at June 30, 2011	779,781	$36.15