Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
SENIOR UNSECURED NOTES, net of debt issuance costs, discount and premium	$ 3,064,971	$ 3,062,955
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Liability Derivatives	0	0
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other(1)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,073	1,235
Derivative Asset, Fair Value, Gross Liability	(4,073)	(1,235)
Derivative Liability, Fair Value, Gross Liability	(11,762)	(12,384)
Derivative Liability, Fair Value, Gross Asset	11,762	12,384
Not qualifying or not designated as hedges under accounting rules | Swaps | Current Assets - Other(1)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,957	3,710
Not qualifying or not designated as hedges under accounting rules | Swaps | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(5,152)	(5,536)
Designated as hedges under accounting rules | Commodity Derivatives
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Liability Derivatives	0	0
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other(1)
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	529	716
Derivative Asset, Fair Value, Gross Liability	(529)	(716)
Derivative Liability, Fair Value, Gross Liability	(1,856)	(120)
Derivative Liability, Fair Value, Gross Asset	$ 1,856	$ 120