Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (22,889)	$ 84,290	$ 117,253
Other comprehensive income (loss):
Unrealized gain (loss) on valuation of interest rate swap agreements	(19,322)	(21,813)	(2,721)
Amount reclassified into interest expense	8,870	1,231	1,845
Other comprehensive income (loss)	(10,452)	(20,582)	(876)
Comprehensive income (loss)	(33,341)	63,708	116,377
Net (income) loss attributable to non-controlling interests and private perpetual preferred unitholders	6,177	(34,845)	(51,650)
Other comprehensive (income) loss attributable to non-controlling interests	4,003	8,254	382
Comprehensive income (loss) attributable to common stockholders	$ (23,161)	$ 37,117	$ 65,109