CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 89,936	$ 53,715	$ 50,667
Other Comprehensive (loss) income:
Unrealized loss on valuation of swap agreements	(3,519)	(5,611)	(2,683)
Reclassification of realized interest on swap agreements	2,268	3,081	2,749
Other comprehensive (loss) income	(1,251)	(2,530)	66
Comprehensive income	88,685	51,185	50,733
Comprehensive income attributable to noncontrolling interests	(49,373)	(686)	(20,539)
Comprehensive income attributable to Common Shareholders	$ 39,312	$ 50,499	$ 30,194