Debt (Schedule Of The Components Of Long-Term Debt) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Jun. 21, 2019	Dec. 31, 2018	Aug. 31, 2016
Debt Instrument [Line Items]
Total face value of long-term debt		$ 381,365,000		$ 356,069,000
Unamortized debt issuance costs		(4,820,000)		(3,190,000)
Less: current portion of long-term debt		(132,555,000)		(54,769,000)
Total long-term debt		$ 243,990,000		$ 298,110,000
Convertible Notes [Member] | 3.25% Convertible Notes Due 2019 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		3.25%		3.25%
Convertible Notes [Member] | 3.25% Convertible Notes Due 2019 [Member] | Corporate Activities [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	[1]			$ 53,457,000
Unamortized debt issuance costs				$ (400,000)
Interest rate, stated percentage		3.25%		3.25%
Debt Instrument, Maturity Date		Oct. 01, 2019
Convertible Notes [Member] | 4.125% Convertible Notes Due 2022 [Member] | Corporate Activities [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	[2]	$ 149,256,000		$ 142,708,000
Unamortized debt issuance costs		$ (2,000,000.0)		$ (2,800,000)
Interest rate, stated percentage		4.125%		4.125%	4.125%
Debt instrument, face amount					$ 170,000,000.0
Convertible Notes [Member] | 4.00% Convertible Notes Due 2024 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage		4.00%
Convertible Notes [Member] | 4.00% Convertible Notes Due 2024 [Member] | Corporate Activities [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	[3]	$ 83,497,000
Unamortized debt issuance costs		$ (2,800,000)
Interest rate, stated percentage		4.00%	4.00%
Debt instrument, face amount			$ 105,000,000.0
Debt Instrument, Maturity Date		Jul. 01, 2024
$8.1 Million Promissory Note [Member]
Debt Instrument [Line Items]
Debt instrument, face amount				$ 8,100,000
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Total face value of long-term debt		$ 16,512,000		17,804,000
Partnership [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total face value of long-term debt	[4]	132,100,000		134,000,000
Debt instrument, face amount		$ 200,000,000.0		200,000,000.0
Debt Instrument, Maturity Date		Jul. 01, 2020
Partnership [Member] | $8.1 Million Promissory Note [Member]
Debt Instrument [Line Items]
Total face value of long-term debt				$ 8,100,000

[1] Includes $0.4 million of unamortized debt issuance costs as of December 31, 2018.

[2] Includes $2.0 million and $2.8 million of unamortized debt issuance costs as of December 31, 2019 and 2018, respectively.

[3] Includes $2.8 million of unamortized debt issuance costs as of December 31, 2019.

[4] The Green Plains Partners revolving credit facility is included in current maturities of long-term debt balance on the consolidated balance sheet as of December 31, 2019 as its maturity date is July 1, 2020.