Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		$ 26,931	$ 269
Restricted cash		450	429
Commodity derivatives, net	[1]	11,789	25,885
Provisionally priced contracts	[2]	(236,990)	(92,220)
Convertible preferred securities	[3]	13,550	13,300
Other assets and liabilities	[4]	5,661	8,203
Total		(178,609)	(44,134)
Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		26,931	269
Restricted cash		450	429
Commodity derivatives, net	[1]	26,890	72,868
Provisionally priced contracts	[2]	(133,842)	0
Convertible preferred securities	[3]	0	0
Other assets and liabilities	[4]	8,635	10,869
Total		(70,936)	84,435
Level 2
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		0	0
Restricted cash		0	0
Commodity derivatives, net	[1]	(15,101)	(46,983)
Provisionally priced contracts	[2]	(103,148)	(92,220)
Convertible preferred securities	[3]	0	0
Other assets and liabilities	[4]	(3,324)	(2,666)
Total		(121,573)	(141,869)
Level 3
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		0	0
Restricted cash		0	0
Commodity derivatives, net	[1]	0	0
Provisionally priced contracts	[2]	0	0
Convertible preferred securities	[3]	13,550	13,300
Other assets and liabilities	[4]	350	0
Total		$ 13,900	$ 13,300

[1] Includes associated cash posted/received as collateral

[2] Included in "Provisionally priced contracts" are those instruments based only on underlying futures values (Level 1) and delayed price contracts (Level 2).

[3] Recorded in “Other noncurrent assets” on the Company’s Consolidated Balance Sheets at December 31, 2014.

[4] Included in other assets and liabilities are deferred compensation assets and ethanol risk management contracts (Level 1), interest rate derivatives (Level 2) and contingent consideration to the former owners of Kay Flo Industries, Inc (Level 3)