CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 26,155	$ 85,458	$ 100,030	$ 123,995
Other comprehensive (loss) income
Unrealized (loss) income on valuation of swap agreements	(5,279)	2,644	(14,098)	(1,655)
Reclassification of realized interest on swap agreements	1,140	2,399	2,186	3,452
Other comprehensive (loss) income	(4,139)	5,043	(11,912)	1,797
Comprehensive income	22,016	90,501	88,118	125,792
Comprehensive income attributable to noncontrolling interests	(7,851)	(60,461)	(52,032)	(82,029)
Comprehensive income attributable to Common Shareholders	$ 14,165	$ 30,040	$ 36,086	$ 43,763