Beneficiaries Equity of the Parent Company - Number of Shares and Net Income Used to Calculate Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator
Net income	$ 8,087	$ 4,583
Net income attributable to noncontrolling interests, Basic	(65)	(60)
Nonforfeitable dividends allocated to unvested restricted shareholders, Basic	(131)	(119)
Net income attributable to noncontrolling interests, Diluted	(65)	(60)
Nonforfeitable dividends allocated to unvested restricted shareholders, Diluted	(131)	(119)
Net income attributable to common shareholders, Diluted	$ 7,891	$ 4,404
Denominator
Basic weighted average shares outstanding (in shares)	176,069,968	175,857,358
Contingent securities/Share based compensation (in shares)	583,491	606,860
Diluted weighted average shares outstanding (in shares)	176,653,459	176,464,218
Earnings per Common Share:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.04	$ 0.03
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.04	$ 0.02