Equity and Redeemable Non-controlling Interest - Narrative (Details) - USD ($)	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Class of Stock [Line Items]
Preferred stock, liquidation preference (in dollars per share)	$ 500.00	$ 500.00					$ 500.00		$ 500.00
Redeemable preferred stock dividends	$ 0			$ 0			$ 24,000	$ 0
Preferred stock, dividend rate (as a percent)									12.50%
Preferred stock, liquidation preference, per share, per annum (in dollars per share)									$ 62.50
Dividends, including payout to noncontrolling interests	9,300,000			8,800,000			27,500,000	25,900,000
Dividends accrued	2,500,000						2,500,000		$ 2,500,000
Increase (decrease) to carrying value INREIT OP	$ 15,000			$ (73,000)			$ 96,000	$ 514,000
Stock repurchased during period (in shares)	271,506	279,136	258,624	229,355	323,706	401,116
Stock repurchased during period, value	$ 7,492,000	$ 7,826,000	$ 7,363,000	$ 6,831,000	$ 10,177,000	$ 13,025,000
Share Repurchase Plan
Class of Stock [Line Items]
Stock repurchased during period (in shares)	257,652			223,715			778,489	948,536
Stock repurchased during period, value	$ 7,100,000			$ 6,700,000			$ 21,800,000	$ 29,900,000
Redeemable Non-controlling Interest in INREIT OP
Class of Stock [Line Items]
Distributions payable to noncontrolling interests	14,000						14,000		26,000
Third Parties
Class of Stock [Line Items]
Dividends accrued	$ 600,000						$ 600,000		$ 500,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, redemption amount		$ 62,500