Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator - Basic:
Net income (loss)	$ (13,037)	$ (22,889)	$ 84,290
Private perpetual preferred unit distributions	(4,201)	(4,197)	(1,743)
Net (income) loss attributable to non-controlling interests	6,527	10,374	(33,102)
Earnings allocated to unvested shares	(26)	(60)	(45)
Net income (loss) attributable to common stockholders - basic	(10,737)	(16,772)	49,400
Numerator - Diluted:
Net income (loss)	(13,037)	(22,889)	84,290
Private perpetual preferred unit distributions	(4,201)	(4,197)	(1,743)
Earnings allocated to unvested shares	(26)	(60)	(45)
Net income (loss) attributable to common stockholders - diluted	$ (17,264)	$ (27,146)	$ 82,502
Denominator:
Weighted average shares outstanding - basic (in shares)	172,445,000	175,169,000	178,340,000
Operating partnership units (in shares)	104,975,000	108,657,000	119,458,000
Effect of dilutive securities:
Stock-based compensation plans (in shares)	0	11,000	0
Weighted average shares outstanding - dilutive (in shares)	277,420,000	283,837,000	297,798,000
Earnings per share:
Basic (in USD per share)	$ (0.06)	$ (0.10)	$ 0.28
Diluted (in USD per share)	$ (0.06)	$ (0.10)	$ 0.28
Antidilutive securities (in shares)	1,052,390	307,536	416,492