Stock-based Compensation - Summary of Activity in the Trust's Restricted Share Units (Details) - $ / shares	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Weighted Average Grant Date Fair Value
Common stock, shares issued (in shares)	226,763,146	224,678,116
2013 Plan | Executive Awards
Restricted Share Units
Non-vested at the beginning of the period (in shares)	976,570
Granted (in shares)	299,019
Vested (in shares)	(228,649)
Non-vested at the end of the period (in shares)	1,046,940
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 22.59
Granted (in dollars per share)	20.51
Vested (in dollars per share)	25.27
Non-vested at end of period (in dollars per share)	$ 21.41
Common stock, shares issued (in shares)	361,679
Restricted stock, shares issued net of shares for tax withholdings (in shares)	160,573
2013 Plan | Trustee Awards
Restricted Share Units
Non-vested at the beginning of the period (in shares)	63,008
Granted (in shares)	64,004
Vested (in shares)	(41,220)
Non-vested at the end of the period (in shares)	85,792
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 17.85
Granted (in dollars per share)	16.67
Vested (in dollars per share)	18.20
Non-vested at end of period (in dollars per share)	$ 16.81