Summary of Quarterly Results (unaudited) - Summary of Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Revenues	$ 182,358	$ 176,775	$ 171,118	$ 183,986	$ 186,769	$ 191,253	$ 181,343	$ 184,389	$ 714,237	$ 743,754	$ 707,671
Net (loss) income attributable to the common stockholders	$ (14,824)	$ (6,958)	$ (6,270)	$ 3,348	$ (50,145)	$ 7,082	$ 2,455	$ 3,709	$ (24,704)	$ (36,899)	$ 9,147
(Loss) income Per Common Share Basic	$ (0.07)	$ (0.03)	$ (0.03)	$ 0.01	$ (0.22)	$ 0.03	$ 0.01	$ 0.02	$ (0.11)	$ (0.16)	$ 0.04
(Loss) income Per Common Share Diluted	$ (0.07)	$ (0.03)	$ (0.03)	$ 0.01	$ (0.22)	$ 0.03	$ 0.01	$ 0.02	$ (0.11)	$ (0.16)	$ 0.04