Fair Value Measurements - Fair Value Amounts by Hierarchy Level (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Liabilities
Gross fair value and net carrying value on balance sheet	$ 0	$ (8,206)
Fair Value, Measurements, Recurring
Liabilities
Liabilities, fair value disclosure, gross	(23,981)	(34,306)
Derivative, fair value, net	13,489	4,595
Financial and nonfinancial liabilities, fair value disclosure	(10,492)	(29,711)
Cash collateral	12,500	19,800
Interest rate derivatives \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	(3,282)	(1,427)
Effect of Counter-Party Netting	0	0
Net Carrying Value on Balance Sheet	(3,282)	(1,427)
Level 1 \| Fair Value, Measurements, Recurring
Liabilities
Liabilities, fair value disclosure, gross	(302)	(10,129)
Level 1 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Level 2 \| Fair Value, Measurements, Recurring
Liabilities
Liabilities, fair value disclosure, gross	(18,384)	(1,427)
Level 2 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	(3,282)	(1,427)
Level 3 \| Fair Value, Measurements, Recurring
Liabilities
Liabilities, fair value disclosure, gross	(5,295)	(22,750)
Level 3 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Over the Counter \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet		(8,206)
Effect of Counter-Party Netting		0
Over the Counter \| Level 1 \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet		0
Over the Counter \| Level 2 \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet		0
Over the Counter \| Level 3 \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet		(8,206)
Exchange Traded \| Futures \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	16,452	6,670
Effect of Counter-Party Netting	(13,489)	(4,595)
Net Carrying Value on Balance Sheet	2,963	2,075
Liabilities
Gross Fair Value	(15,404)	(10,129)
Effect of Counter-Party Netting	13,489	4,595
Net Carrying Value on Balance Sheet	(1,915)	(5,534)
Exchange Traded \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	(12,286)	173
Effect of Counter-Party Netting	0	0
Net Carrying Value on Balance Sheet	(12,286)	173
Exchange Traded \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	6,991	(14,717)
Effect of Counter-Party Netting	0	0
Net Carrying Value on Balance Sheet	6,991	(14,717)
Exchange Traded \| Level 1 \| Futures \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	219	4,595
Liabilities
Gross Fair Value	(302)	(10,129)
Exchange Traded \| Level 1 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 1 \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 2 \| Futures \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	16,233	2,075
Liabilities
Gross Fair Value	(15,102)	0
Exchange Traded \| Level 2 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 2 \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 3 \| Futures \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	0	0
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 3 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	(12,286)	173
Exchange Traded \| Level 3 \| MLC terminal obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	$ 6,991	$ (14,717)

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Fair value of financial and nonfinancial obligations.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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