Shareholders' Equity and Earnings (Loss) Per Common Share - Basic and Diluted Earnings (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Shareholders' Equity and Earnings Per Common Share
Net income (loss)	$ 996	$ (25,005)	$ (26,391)	$ (17,093)
Net (income) loss attributable to redeemable noncontrolling interests	(103)	2,212	2,472	445
Net loss attributable to noncontrolling interests			1,108
Net income (loss) attributable to common shareholders	893	(22,793)	(22,811)	(16,648)
Distributions to participating securities	(763)	(822)	(1,497)	(1,729)
Net income (loss) available to common shareholders - basic	130	(23,615)	(24,308)	(18,377)
Net income (loss) available to common shareholders - diluted	$ 130	$ (23,615)	$ (24,308)	$ (18,377)
Weighted average number of common shares outstanding - basic	131,351	133,620	131,456	133,924
Weighted average number of common shares outstanding - diluted	131,351	133,620	131,456	133,924
Earnings (loss) per common share - basic	$ 0.00	$ (0.18)	$ (0.18)	$ (0.14)
Earnings (loss) per common share - diluted	$ 0.00	$ (0.18)	$ (0.18)	$ (0.14)