CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 149,970	$ 152,146	$ 44,640
Other comprehensive (loss) income:
Unrealized (loss) gain on valuation of swap agreements	(5,061)	(9,061)	3,610
Reclassification of realized interest on swap agreements	5,524	3,776	2,892
Other comprehensive income (loss)	463	(5,285)	6,502
Comprehensive income	150,433	146,861	51,142
Comprehensive income attributable to noncontrolling interests	(85,183)	(80,934)	(5,588)
Comprehensive income attributable to Common Shareholders	$ 65,250	$ 65,927	$ 45,554