Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands						1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 30, 2020	Jul. 15, 2020	Jul. 01, 2020	Apr. 15, 2020	Jan. 15, 2020	Jul. 31, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jul. 02, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Preferred stock, shares authorized (in shares)										100,000,000			100,000,000
Dividends and distributions										$ 35,549	$ 28,003
Dividends and distributions declared per common share and unit (in dollars per share)							$ 0.22	$ 0.21	$ 0.21
Construction loans
Subsequent Event [Line Items]
Borrowings under construction loans										$ 31,600
Construction loans | Subsequent Event
Subsequent Event [Line Items]
Borrowings under construction loans						$ 2,900
Common Class A | Operating Partnership | Subsequent Event
Subsequent Event [Line Items]
Shares issued through public offering (in shares)			756,697
Common stock | Subsequent Event
Subsequent Event [Line Items]
Dividends and distributions declared per common share and unit (in dollars per share)	$ 0.11
Redeemable convertible preferred stock
Subsequent Event [Line Items]
Preferred stock, shares authorized (in shares)										2,930,000			2,930,000
Dividends and distributions				$ 1,100	$ 1,100
Redeemable convertible preferred stock | Subsequent Event
Subsequent Event [Line Items]
Additonal shares authorized (in shares)												3,450,000
Preferred stock, shares authorized (in shares)												6,380,000
Dividends and distributions		$ 1,200
Preferred stock | Redeemable convertible preferred stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, dividends declared (in dollars per share)	$ 0.421875
At The Market Program | Subsequent Event
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction						166,630
Sale of stock, weighted average price per share						$ 10.16
Consideration received on transaction						$ 1,700
At The Market Program | Series A Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction						709,588
Sale of stock, weighted average price per share						$ 22.87
Consideration received on transaction						$ 16,000
Revolving Credit Facility | Operating Partnership | New Credit Facility
Subsequent Event [Line Items]
Credit facility, amount outstanding										$ 80,000			$ 110,000
Revolving Credit Facility | Operating Partnership | New Credit Facility | Subsequent Event
Subsequent Event [Line Items]
Proceeds from (repayments of) lines of credit						(32,000)
Credit facility, amount outstanding						$ 48,000