Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (10,183)	$ (12,269)	$ (8,963)	$ (23,599)
Other comprehensive income (loss):
Unrealized gain (loss) on valuation of interest rate swap agreements	(103)	64	(139)	(19,340)
Less: amount reclassified into interest expense	2,920	2,873	8,687	5,986
Other comprehensive income (loss)	2,817	2,937	8,548	(13,354)
Comprehensive loss	(7,366)	(9,332)	(415)	(36,953)
Net loss attributable to non-controlling interests and private perpetual preferred unitholders	3,206	4,065	1,440	7,097
Other comprehensive (income) loss attributable to non-controlling interests	(1,061)	(1,060)	(3,239)	5,114
Comprehensive loss attributable to common stockholders	$ (5,221)	$ (6,327)	$ (2,214)	$ (24,742)