Discontinued Operations and Assets and Liabilities Held-for-Sale - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions		6 Months Ended
	Apr. 10, 2017 $ / shares shares	Jun. 30, 2017 USD ($)	Aug. 04, 2017	Feb. 28, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment		$ 11.4
Indemnification Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit				$ 6.0
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				$ 8.0
UCP
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Right to cash ($ per share) | $ / shares	$ 5.32
Merger stock exchange ratio	0.2309
Initial lockup period	60 days
Stock acquired (shares) | shares	1.3
Periodic lockup period	50 days
Lockup period	210 days
Subsequent Event | 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%