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Land and Development - Acquisitions, Dispositions, and Impairments (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) a property	Dec. 31, 2018 USD ($)	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Revenues		$ 145,338	$ 122,141	$ 350,608	$ 657,956
Number of land parcels sold | property					2
Area of land parcels sold (acres) | a					93
Loan receivable		660,522		660,522		$ 870,992
Impairment of land and development assets				1,100	$ 1,300
Financing provided to buyers
Property, Plant and Equipment [Line Items]
Financing provided to buyers of land parcels					145,000
Loan receivable		85,100		85,100
Land development
Property, Plant and Equipment [Line Items]
Revenues		54,918	12,309	76,691	369,665
Cost of sales expense		$ 48,101	$ 12,114	$ 71,785	318,881
Land
Property, Plant and Equipment [Line Items]
Acquisitions of land and development assets through foreclosure					$ 4,600
Unconsolidated entity
Property, Plant and Equipment [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
Property, Plant and Equipment [Line Items]
Equity interest (percent)		50.00%		50.00%			50.00%

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