Subsequent Events (Details) $ / shares in Units, $ in Millions			3 Months Ended						9 Months Ended
	Oct. 29, 2020 $ / shares	Oct. 26, 2020 USD ($) a property	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 $ / shares	Mar. 31, 2020 $ / shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Sep. 30, 2020 USD ($) shares	Nov. 03, 2020 property shares
Subsequent Event [Line Items]
Dividends per share, common stock (in dollars per share) | $ / shares			$ 0.29	$ 0.27	$ 0.27	$ 0.27	$ 0.24	$ 0.24
Shares repurchase program, authorized repurchase amount (in shares) | shares			3,000,000						3,000,000
Asset Acquisitions 2020
Subsequent Event [Line Items]
Purchase price | $			$ 6.5						$ 47.6
Subsequent event
Subsequent Event [Line Items]
Dividends per share, common stock (in dollars per share) | $ / shares	$ 0.29
Shares repurchase program, authorized repurchase amount (in shares) | shares										3,000,000
Subsequent event | COVID-19
Subsequent Event [Line Items]
Number of deferrals granted										59
Deferrals granted, percentage of annualized base rent										2.60%
Number of tenants which completed rent deferral period and fully repaid deferral										13
Rent deferrals completed and fully paid as a percentage of annualized base rent.										0.10%
Rent deferrals competed and fully repaid as a percentage of total deferrals.										5.40%
Number of tenants currently in deferral and are fulfilling the deferral agreement										34
Number of tentants currently in deferral and fulfilling deferral agreements as a percentage of annualized base rent										2.20%
Number of tenants currently in deferral and fulfilling deferral agreements as a percentage of total deferrals										82.30%
Number of tentants that have defaulted on rent deferral repayments.										12
Number of tentants that have defaulted on rent deferral repayments as a percentage of annualized base rent										0.30%
Number of tentants that have defaulted on rent deferral repayments as a percentage of total deferrals										12.30%
Subsequent event | Asset Acquisitions 2020 | Land parcels
Subsequent Event [Line Items]
Number of properties acquired		1
Area of real estate property acquired | a		1.9
Purchase price | $		$ 10.0