Fair Value Measurements - Fair Value Amounts by Hierarchy Level (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Liabilities
Gross fair value and net carrying value on balance sheet	$ (6,289)	$ (5,007)
Fair Value, Measurements, Recurring
Assets
Gross Fair Value		5,595
Effect of Counter-Party Netting		(431)
Net Carrying Value on Balance Sheet		5,164
Liabilities
Liabilities, fair value disclosure, gross	47,622	2,053
Derivative, fair value, net	18,607	431
Financial and nonfinancial liabilities, fair value disclosure	29,015	1,622
Cash collateral	10,100	10,900
Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		191
Effect of Counter-Party Netting		0
Net Carrying Value on Balance Sheet		191
Level 1 \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		170
Liabilities
Liabilities, fair value disclosure, gross	153	870
Level 1 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		0
Level 2 \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		5,425
Liabilities
Liabilities, fair value disclosure, gross	20,728	261
Level 2 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		191
Level 3 \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		0
Liabilities
Liabilities, fair value disclosure, gross	26,741	922
Level 3 \| Interest rate derivatives \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value		0
Over the Counter \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet	(6,289)	(5,007)
Over the Counter \| Level 1 \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet	0	0
Over the Counter \| Level 2 \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet	0	0
Over the Counter \| Level 3 \| Fair Value, Measurements, Recurring
Liabilities
Gross fair value and net carrying value on balance sheet	(6,289)	(5,007)
Exchange Traded \| Future \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	20,014	5,404
Effect of Counter-Party Netting	(18,607)	(431)
Net Carrying Value on Balance Sheet	1,407	4,973
Liabilities
Gross Fair Value	(20,881)	(1,131)
Effect of Counter-Party Netting	18,607	431
Net Carrying Value on Balance Sheet	(2,274)	(700)
Exchange Traded \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	(13,222)	4,085
Effect of Counter-Party Netting	0	0
Net Carrying Value on Balance Sheet	(13,222)	4,085
Exchange Traded \| MLC repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	(7,230)
Effect of Counter-Party Netting	0
Net Carrying Value on Balance Sheet	(7,230)
Exchange Traded \| Level 1 \| Future \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	238	170
Liabilities
Gross Fair Value	(153)	(870)
Exchange Traded \| Level 1 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 1 \| MLC repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0
Exchange Traded \| Level 2 \| Future \| Fair Value, Measurements, Recurring
Assets
Gross Fair Value	19,776	5,234
Liabilities
Gross Fair Value	(20,728)	(261)
Exchange Traded \| Level 2 \| J. Aron repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0	0
Exchange Traded \| Level 2 \| MLC repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	0
Exchange Traded \| Level 3 \| Future \| 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	(13,222)	$ 4,085
Exchange Traded \| Level 3 \| MLC repurchase obligation derivative \| Fair Value, Measurements, Recurring
Liabilities
Gross Fair Value	$ (7,230)

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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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 asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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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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