Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Employee Stock-Based Compensation Costs Table

	For the three months ended
	March 31,
	2012	2011
	(in thousands)
Stock-based compensation cost –  expensed	$2,844	$2,450
Stock-based compensation cost – capitalized	2,864	1,910

Summary of Stock Option Activity, Options Outstanding

		Weighted
		Average
	Number	Exercise
	of Options	Price
Outstanding at December 31, 2011	4,741,732	$21.24
Granted	5,300	32.27
Exercised	(189,475)	13.41
Forfeited or expired	(16,976)	37.74
Outstanding at March 31, 2012	4,540,581	$21.52
Exercisable at March 31, 2012	3,322,436	$15.84

Summary of Restricted Stock Activity and Unvested Shares

		Weighted
		Average
	Number	Grant Date
	of Shares	Fair Value
Unvested shares at December 31, 2011	1,019,737	$36.71
Granted	4,689	32.35
Vested	(14,868)	36.72
Forfeited	(22,745)	37.46
Unvested shares at March 31, 2012	986,813	$36.70