Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Stock-Based Compensation [Abstract]

Employee Stock-Based Compensation Costs

	For the three months ended				For the nine months ended
	September 30,				September 30,
	2013		2012		2013		2012
	(in thousands)
Stock-based compensation cost – expensed	$	2,921	$	2,677	$	8,883	$	8,226
Stock-based compensation cost – capitalized	$	2,809	$	2,482	$	8,543	$	7,788

Summary of Stock Option Activity, Options Outstanding

		Weighted
		Average
	Number	Exercise
	of Options	Price
Outstanding at December 31, 2012	3,649,520	$	29.84
Granted	26,010		38.76
Exercised	(705,991)		9.60
Forfeited or expired	(55,756)		37.47
Outstanding at September 30, 2013	2,913,783		34.68
Exercisable at September 30, 2013	1,699,151	$	34.06

Summary of Restricted Stock Activity and Unvested Shares

		Weighted
		Average
	Number	Grant Date
	of Shares	Fair Value
Unvested shares at December 31, 2012	1,117,515	$	35.64
Granted	32,346		37.53
Vested	(30,884)		36.19
Forfeited	(58,560)		35.77
Unvested shares at September 30, 2013	1,060,417	$	35.67