Supplemental Cash Flow Information and Schedule of Non-Cash Investing and Financing Activity (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Supplemental cash flow information [Abstract]
Cash paid for interest	$ 19,689	$ 27,870
Cash paid for income taxes	1,120	34
Supplemental schedule of non-cash investing and financing activity [Abstract]
Mortgage note payable transferred to purchaser	(224,498)	0
Restricted shares and deferred incentive share units issued (forfeited)	(654)	2,251
Mortgage loan assumed in purchase	0	87,225
Contingent Consideration	0	31,000
Common Stock Issued	263	272
Preferred Stock Issued	75	0
O P Unit Conversion	$ 15,112	$ 0