Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 3,075	$ 2,832
Capitalized share-based compensation	(202)	(230)
Share-based compensation expense	2,873	2,602
Restricted Stock [Member]
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	2,989	2,674
Stock Options [Member]
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 86	$ 158