Reportable Segments (Revenue Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Plus rental property operating expenses	$ (90,498)	$ (50,329)	$ (40,817)
Total consolidated revenues	210,741	136,846	118,125
Total
Segment Reporting Information [Line Items]
Net operating income	138,080	110,457	110,553
Sales less cost of sales	1,464	5,224	7,486
Fee income	10,967	34,162	33,180
Other income	3,528	5,153	2,204
Plus rental property operating expenses	90,498	50,329	40,817
Cost of sales	1,753	1,833	5,378
Net operating income in joint ventures	(27,763)	(23,596)	(24,258)
Sales less cost of sales in joint ventures	(111)	(28)	(1,927)
Net operating income in discontinued operations	(6,390)	(22,983)	(32,410)
Fee income in discontinued operations	(76)	(16,364)	(19,359)
Other income in discontinued operations	(64)	(3,622)	(281)
Gain on tract sales (included in gain on investment properties)	(1,145)	(3,719)	(3,258)
Total consolidated revenues	$ 210,741	$ 136,846	$ 118,125