Discontinued Operations and Assets and Liabilities Held-for-Sale - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended
	Aug. 04, 2017 USD ($) $ / shares	Oct. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Apr. 10, 2017 $ / shares	Feb. 28, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of Century stock						$ 60,043
Indemnification Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit									$ 6,000
Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss on long-lived assets				$ 11,400	$ 4,416	$ 102	$ 6,812
Agribusiness | Discontinued Operations, Disposed of by Sale | Maximum | Indemnification Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indemnification claims guaranteed in excess of escrow									$ 8,000
Merger Of UCP And Century Communities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost method, ownership percentage	9.00%
UCP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Right to cash (in dollars per share) | $ / shares	$ 5.32							$ 5.32
Merger stock exchange ratio								0.2309
Impairment loss on long-lived assets	$ 9,311
Subsequent Event | UCP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of Century stock		$ 59,200
Loss on sale of Century stock		$ 842