Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		$ 0	$ 26,931	$ 16,121
Restricted cash		190	450	181
Commodity derivatives, net	[1]	(541)	11,789	9,726
Provisionally price contracts	[2]	(99,522)	(236,990)	(135,649)
Convertible preferred securities	[3]	3,294	13,550	12,800
Other assets and liabilities	[4]	6,241	5,661	7,154
Total		(90,338)	(178,609)	(89,667)
Level 1
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		0	26,931	16,121
Restricted cash		190	450	181
Commodity derivatives, net	[1]	34,620	26,890	34,337
Provisionally price contracts	[2]	(79,022)	(133,842)	(81,037)
Convertible preferred securities	[3]	0	0	0
Other assets and liabilities	[4]	11,015	8,635	10,814
Total		(33,197)	(70,936)	(19,584)
Level 2
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		0	0	0
Restricted cash		0	0	0
Commodity derivatives, net	[1]	(35,161)	(15,101)	(24,611)
Provisionally price contracts	[2]	(20,500)	(103,148)	(54,612)
Convertible preferred securities	[3]	0	0	0
Other assets and liabilities	[4]	(4,774)	(3,324)	(4,010)
Total		(60,435)	(121,573)	(83,233)
Level 3
Assets and liabilities measured at fair value on a recurring basis
Cash equivalents		0	0	0
Restricted cash		0	0	0
Commodity derivatives, net	[1]	0	0	0
Provisionally price contracts	[2]	0	0	0
Convertible preferred securities	[3]	3,294	13,550	12,800
Other assets and liabilities	[4]	0	350	350
Total		$ 3,294	$ 13,900	$ 13,150

[1] Includes associated cash posted/received as collateral

[2] Recorded in “Other noncurrent assets” on the Company’s Condensed Consolidated Balance Sheets

[3] Recorded in “Other noncurrent assets” on the Company’s Condensed Consolidated Balance Sheets

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