Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	[1]	$ 285,105	$ 177,467
Provisionally priced contracts	[2]	(45,853)	(29,025)
Convertible preferred securities	[3]	11,618	8,849
Other assets and liabilities	[4]	(4,577)	(18,086)
Total		246,293	139,205
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net		128,407	51,369
Provisionally priced contracts		43,944	19,793
Convertible preferred securities		0	0
Other assets and liabilities		2,784	7,972
Total		175,135	79,134
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net		156,698	126,098
Provisionally priced contracts		(89,797)	(48,818)
Convertible preferred securities		0	0
Other assets and liabilities		(7,361)	(26,058)
Total		59,540	51,222
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		11,618	8,849
Other assets and liabilities		0	0
Total		$ 11,618	$ 8,849

[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 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 and foreign exchange derivative contracts (Level 1), as well as interest rate derivatives (Level 2)