Discontinued Agribusiness Operations - Narrative (Details) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2015 USD ($) account permit	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt		$ 81,895		$ 81,895		$ 84,045
Cash and cash equivalents		300	$ 10	300	$ 10	301
Impairment loss on classification of assets as held-for-sale, net of tax		(16,903)		(16,903)
Payments for selling and other sale costs		$ 2,000
Loss on real estate				$ (274)		$ (2,865)
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross selling price	$ 105,300
Disposal Group, Including Discontinued Operation, Consideration, Gross	127,000
Working capital adjustment	$ 22,000
Period to determine final working capital adjustment	90 days
Debt	$ 80,900
Selling and other related costs	5,900
Net proceeds	18,400
Cash and cash equivalents	22,600
Escrow deposit	$ 10,200
Number of escrow accounts | account	2
Number of environmental permits | permit	2
Period for resolution of operational matters	6 months
Transaction costs	$ 4,400
Deferred debt financing fees	2,000
Subsequent Event | Indemnification Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit	$ 6,000
Period for release of escrow	18 months
Indemnification claims guaranteed in excess of escrow	$ 8,000
Period of guarantee	5 years
Subsequent Event | Performance Guarantee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit	$ 4,200
Subsequent Event | Performance Guarantee, Waste Water
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit	1,800
Subsequent Event | Performance Guarantee, Air Quality
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Escrow deposit	$ 2,400