Supplemental Cash Flow Information and Schedule of Non-Cash Investing and Financing Activity (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Supplemental cash flow information [Abstract]
Cash paid for interest	$ 28,312	$ 43,250
Cash paid for income taxes	431	24
Supplemental schedule of non-cash investing and financing activity [Abstract]
Mortgage note payable transferred to purchaser	(254,095)	0
Restricted shares and deferred incentive share units issued (forfeited)	(862)	2,240
Mortgage loan assumed in purchase	0	87,225
Contingent Consideration	0	19,000
Common Stock Issued	263	319
Stock Issued Pursuant to TPG Management Services Agreement	150	0
Operating partnership units converted to common stock	$ 15,112	$ 0