CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 326	$ 18,104	$ 100,356	$ 142,099
Other comprehensive income (loss)
Unrealized income (loss) on valuation of swap agreements	1,474	(5,671)	(12,624)	(7,328)
Reclassification of realized interest on swap agreements	1,210	1,026	3,396	4,478
Other comprehensive income (loss)	2,684	(4,645)	(9,228)	(2,850)
Comprehensive income	3,010	13,459	91,128	139,249
Comprehensive loss (income) attributable to noncontrolling interests	5,478	(3,743)	(46,554)	(85,772)
Comprehensive income attributable to Common Shareholders	$ 8,488	$ 9,716	$ 44,574	$ 53,477