Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator - Basic:
Net income	$ 8,288	$ 9,856
Private perpetual preferred unit distributions	(1,050)	(234)
Net income attributable to non-controlling interests	(2,743)	(3,945)
Earnings allocated to unvested shares	(11)	(7)
Net income attributable to common stockholders - basic	4,484	5,670
Numerator - Diluted:
Net income	8,288	9,856
Private perpetual preferred unit distributions	(1,050)	(234)
Earnings allocated to unvested shares	(11)	(7)
Net income attributable to common stockholders - diluted	$ 7,227	$ 9,615
Denominator:
Weighted average shares outstanding - basic (in shares)	181,741,000	175,850,000
Operating partnership units (in shares)	110,904,000	122,199,000
Effect of dilutive securities:
Stock-based compensation plans (in shares)	0	0
Weighted average shares outstanding - diluted (in shares)	292,645,000	298,049,000
Earnings per share:
Basic (in USD per share)	$ 0.02	$ 0.03
Diluted (in USD per share)	$ 0.02	$ 0.03
Antidilutive securities (in shares)	399,894	684