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Land and Development (Acquisitions, Dispositions, Impairments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) land_asset	Dec. 31, 2019 USD ($) land_asset	Dec. 31, 2018 USD ($) a land_asset parcel
Real Estate Properties [Line Items]
Increase in net lease assets upon consolidation of equity method investment	$ 0	$ 0	$ 844,550
Revenue	530,949	479,496	$ 798,122
Number of land parcels sold | parcel			2
Area of land parcels sold (in acres) | a			93
Impairment of assets	7,827	13,419	$ 147,108
Impairment of land and development assets, expected sales proceeds		$ 5,300
Number of land and development assets impaired | land_asset		2	5
Impairment of land and development assets			$ 56,700
Land
Real Estate Properties [Line Items]
Aggregate financing provided to buyers			145,000
Proceeds of notes receivable	58,200	$ 94,200
Land development
Real Estate Properties [Line Items]
Revenue	164,702	119,595	409,710
Cost of sales expense	177,727	109,663	350,181
Land | Real Estate Acquired in Satisfaction of Debt
Real Estate Properties [Line Items]
Increase in net lease assets upon consolidation of equity method investment			$ 4,600
Land and development asset
Real Estate Properties [Line Items]
Impairment of assets	$ 2,700	1,100
Number of land and development assets impaired | land_asset	2
Affiliated Entity
Real Estate Properties [Line Items]
Real estate transaction price		34,300
Payments to acquire land and develop asset		7,300
Assumption of loan in acquisition transaction		$ 27,000
Other Real Estate Equity Investment Dec 2016
Real Estate Properties [Line Items]
Equity interest		50.00%

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