Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	[1]	$ 61,365	$ 18,365
Provisionally priced contracts	[2]	(186,651)	(134,741)
Convertible preferred securities	[3]	8,404	7,154
Other assets and liabilities	[4]	(4,038)	4,833
Total		(120,920)	(104,389)
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net		45,682	37,229
Provisionally priced contracts		(118,414)	(76,175)
Convertible preferred securities		0	0
Other assets and liabilities		9,469	5,186
Total		(63,263)	(33,760)
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net		15,683	(18,864)
Provisionally priced contracts		(68,237)	(58,566)
Convertible preferred securities		0	0
Other assets and liabilities		(13,507)	(353)
Total		(66,061)	(77,783)
Level 3
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net		0	0
Provisionally priced contracts		0	0
Convertible preferred securities		8,404	7,154
Other assets and liabilities		0	0
Total		$ 8,404	$ 7,154

[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 related to certain available for sale securities.

[4] Included in other assets and liabilities are assets held by the Company to fund deferred compensation plans, ethanol risk management contracts, and foreign exchange derivative contracts (Level 1) and interest rate derivatives (Level 2