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Income Taxes (Federal Statutory Income Tax Rate to Income Before Income Taxes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income (loss) from operations before income taxes	$ 100,721,000	$ (10,294,000)	$ 78,120,000
Partnership income not subject to federal income tax	(99,832,000)	10,824,000	(77,704,000)
Income subject to federal income taxes	889,000	530,000	416,000
Tax expense at federal statutory rate	187,000	111,000	146,000
State income taxes, net of federal tax	729,000	1,285,000	1,396,000
Return to provision, federal and state	(219,000)	(128,000)	(163,000)
Other	(42,000)	230,000	(68,000)
Re-measurement of deferred taxes due to enacted tax rate change	0	0	(5,270,000)
Income tax expense (benefit)	$ 655,000	$ 1,498,000	$ (3,959,000)
Effective tax rate on income from operations before income taxes	1.00%	(15.00%)	(5.00%)
Liability for uncertain tax positions	$ 0	$ 0	$ 0

X

- Definition

Represents the income (loss) on our subsidiaries that are subject to federal income taxes. As a limited partnership we are not a taxable entity for federal income tax purposes with the exception of a few of our operations which are owned by wholly-owned corporate subsidiaries that are taxable as corporations.

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As a limited partnership we are not a taxable entity for federal income tax purposes. This amount represents the earnings for those entities that are not taxable entities.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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