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Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value, Liability	$ (34,100)
Preferred Distribution Rate Reset Election | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Embedded Derivative, Fair Value, Liability	(34,120)	$ (51,515)
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,139	207
Derivative Asset, Fair Value, Gross Liability	(1,139)	(207)
Asset Derivatives	0	0
Derivative Liability, Fair Value, Gross Liability	(568)	(2,079)
Derivative Liability, Fair Value, Gross Asset	568	1,064
Liability Derivatives	0	(1,015)
Not qualifying or not designated as hedges under accounting rules | Swap | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1,145	1,382
Not qualifying or not designated as hedges under accounting rules | Swap | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	0
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	690	4
Derivative Asset, Fair Value, Gross Liability	(690)	(4)
Asset Derivatives	0	0
Derivative Liability, Fair Value, Gross Liability	(1,428)	(50)
Derivative Liability, Fair Value, Gross Asset	1,428	50
Liability Derivatives	$ 0	$ 0

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