Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Assets of Discontinued Operations	$ 0	$ 291,100	$ 297,800
Total Liabilities of Discontinued Operations	0	69,500
ASC | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rent and other receivables	0	21,200
Operating assets and facilities, net	0	249,900
Other	0	20,000
Total Assets of Discontinued Operations	0	291,100
Accounts payable and accrued expenses	0	29,700
Deferred income taxes	0	35,800
Other	0	4,000
Total Liabilities of Discontinued Operations	$ 0	$ 69,500