Derivative Instruments and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - Not Designated as Hedging Instrument - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair value of derivatives - Current
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	$ 43,567,000	$ 78,091,000
Effects of Netting	(17,511,000)	(12,977,000)
As Presented with Effects of Netting	26,056,000	65,114,000
Fair value of derivatives - Current \| Contingent consideration arrangements
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	16,718,000
Effects of Netting	0
As Presented with Effects of Netting	16,718,000
Fair value of derivatives - Current \| Commodity derivative instruments
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	26,849,000
Effects of Netting	(17,511,000)
As Presented with Effects of Netting	9,338,000
Fair value of derivatives - Non-current
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	9,216,000
Effects of Netting	0
As Presented with Effects of Netting	9,216,000
Fair value of derivatives - Non-current \| Contingent consideration arrangements
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	9,216,000
Effects of Netting	0
As Presented with Effects of Netting	9,216,000
Fair value of derivatives - Non-current \| Commodity derivative instruments
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	0
Effects of Netting	0
As Presented with Effects of Netting	0
Fair value of derivatives - Current
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	(88,708,000)	(23,457,000)
Effects of Netting	17,511,000	12,977,000
As Presented with Effects of Netting	(71,197,000)	(10,480,000)
Fair value of derivatives - Current \| Contingent consideration arrangements
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	(50,000,000)
Effects of Netting	0
As Presented with Effects of Netting	(50,000,000)
Fair value of derivatives - Current \| Commodity derivative instruments
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	(38,708,000)
Effects of Netting	17,511,000
As Presented with Effects of Netting	(21,197,000)
Fair value of derivatives - Non-current
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	(32,695,000)	(7,440,000)
Effects of Netting	0	0
As Presented with Effects of Netting	(32,695,000)	$ (7,440,000)
Fair value of derivatives - Non-current \| Contingent consideration arrangements
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	(19,760,000)
Effects of Netting	0
As Presented with Effects of Netting	(19,760,000)
Fair value of derivatives - Non-current \| Commodity derivative instruments
Offsetting Assets and Liabilities [Line Items]
Presented without Effects of Netting	(12,935,000)
Effects of Netting	0
As Presented with Effects of Netting	$ (12,935,000)

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