Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 2,692	$ 2,339	$ 5,767	$ 5,171
Capitalized share-based compensation	(186)	(223)	(388)	(453)
Share-based compensation expense	2,506	2,116	5,379	4,718
Restricted Stock [Member]
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	2,624	2,216	5,613	4,890
Stock Options [Member]
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-based compensation incurred	$ 68	$ 123	$ 154	$ 281