Income Taxes (Federal Statutory Income Tax Rate to Income Before Income Taxes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income (loss) from operations before income taxes	$ (136,362,000)	$ (398,987,000)	$ 100,721,000
Partnership income not subject to federal income tax	140,092,000	398,729,000	(99,832,000)
Income (loss) subject to federal income taxes	3,730,000	(258,000)	889,000
Tax expense (benefit) at federal statutory rate	783,000	(54,000)	187,000
State income taxes, net of federal tax	574,000	1,213,000	729,000
Return to provision, federal and state	(227,000)	(383,000)	(219,000)
Other	112,000	117,000	(42,000)
Valuation allowance	428,000	434,000	0
Income tax expense	$ 1,670,000	$ 1,327,000	$ 655,000
Effective tax rate on income (loss) from operations before income taxes	(1.20%)	(0.30%)	0.70%
Liability for uncertain tax positions	$ 0	$ 0	$ 0