Income Taxes (Federal Statutory Income Tax Rate to Income Before Income Taxes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income (loss) from operations before income taxes	$ 132,304,000	$ (136,362,000)	$ (398,987,000)
Partnership income not subject to federal income tax	(126,403,000)	140,092,000	398,729,000
Income (loss) subject to federal income taxes	5,901,000	3,730,000	(258,000)
Tax expense (benefit) at federal statutory rate	1,239,000	783,000	(54,000)
State income taxes, net of federal tax	1,248,000	574,000	1,213,000
Return to provision, federal and state	44,000	(227,000)	(383,000)
Other	(18,000)	112,000	117,000
Valuation allowance	656,000	428,000	434,000
Income tax expense	$ 3,169,000	$ 1,670,000	$ 1,327,000
Effective tax rate on income (loss) from operations before income taxes	2.40%	(1.20%)	(0.30%)
Liability for uncertain tax positions	$ 0	$ 0	$ 0