Financial Instruments - Balance Sheet Location (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commodity contracts | Designated as Hedging Instrument | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities		$ (46)
Commodity contracts | Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 94
Commodity contracts | Not Designated as Hedging Instrument | Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	(6)	(335)
Economic interests in loans | Not Designated as Hedging Instrument | Other non-current assets
Derivatives, Fair Value [Line Items]
Derivative assets	$ 17,501	$ 18,633