CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 11,868	$ 9,614	$ 30,983	$ 20,793
Other comprehensive (loss) income
Unrealized (loss) income on valuation of swap agreements	(2,782)	4,196	(5,112)	3,104
Reclassification of realized interest on swap agreements	936	745	1,773	1,337
Other comprehensive (loss) income	(1,846)	4,941	(3,339)	4,441
Comprehensive income	10,022	14,555	27,644	25,234
Comprehensive (income) attributable to noncontrolling interests	(4,640)	(1,621)	(2,207)	(3,302)
Comprehensive income attributable to Common Shareholders	$ 5,382	$ 12,934	$ 25,437	$ 21,932