Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 8,288	$ 9,856
Other comprehensive income (loss):
Unrealized gain (loss) on valuation of interest rate swap agreements	(17,695)	(7,390)
Less: amount reclassified into interest expense	796	149
Other comprehensive income (loss)	(16,899)	(7,241)
Comprehensive income (loss)	(8,611)	2,615
Net income attributable to non-controlling interests and private perpetual preferred unitholders	(3,793)	(4,179)
Other comprehensive (income) loss attributable to non-controlling interests	6,405	2,969
Comprehensive income (loss) attributable to common stockholders	$ (5,999)	$ 1,405