CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 85,458	$ 11,868	$ 123,995	$ 30,983
Other comprehensive income (loss)
Unrealized income (loss) on valuation of swap agreements	2,644	(2,782)	(1,655)	(5,112)
Reclassification of realized interest on swap agreements	2,399	936	3,452	1,773
Other comprehensive income (loss)	5,043	(1,846)	1,797	(3,339)
Comprehensive income	90,501	10,022	125,792	27,644
Comprehensive income attributable to noncontrolling interests	(60,461)	(4,640)	(82,029)	(2,207)
Comprehensive income attributable to Common Shareholders	$ 30,040	$ 5,382	$ 43,763	$ 25,437