Real Estate (Real Estate Dispositions) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($) property	Jun. 30, 2021 USD ($) property	Jun. 30, 2020 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain | $	$ 4,181	$ 719	$ 8,462	$ 13,489
Assets Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of sold properties | property	15	8	26	22