Real Estate (Real Estate Dispositions) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) Property	Sep. 30, 2020 USD ($) Property	Sep. 30, 2021 USD ($) Property	Sep. 30, 2020 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain | $	$ 9,473	$ 148	$ 17,935	$ 13,637
Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of sold properties | Property	27	3	53	25