Long-Term Incentive Compensation (Summary of Liability-Classified Restricted Stock Unit Activity) (Details) - Liability-Classified RSUs - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Units
Number of Shares/Units, Unvested shares/units at January 1 (in shares)	3,950,000	7,937,000	11,613,000
Number of Shares/Units, Granted (in shares)	0	0	1,486,000
Number of Shares/Units, Vested (in shares)	(2,206,000)	(3,817,000)	(4,522,000)
Number of Shares/Units, Forfeited (in shares)	(3,000)	(170,000)	(640,000)
Number of Shares/Units, Unvested shares/units at December 31 (in shares)	1,741,000	3,950,000	7,937,000
Weighted Average Fair Value
Weighted Average Fair Value, Unvested shares/units at January 1 (in dollars per share)	$ 4.81	$ 4.08	$ 2.67
Weighted Average Fair Value, Granted (in dollars per share)	0	0	4.23
Weighted Average Fair Value, Vested (in dollars per share)	4.84	4.48	3.40
Weighted Average Fair Value, Forfeited (in dollars per share)	5.57	6.83	4.56
Weighted Average Fair Value, Unvested shares/units at December 31 (in dollars per share)	$ 4.67	$ 4.81	$ 4.08
Workforce Reduction
Number of Units
Number of Shares/Units, Forfeited (in shares)			(360,253)