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Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Taxes at statutory U.S. federal income tax rate	21.00%	21.00%	35.00%
Nontaxable income	(21.00%)	(21.00%)	(35.00%)
State and local income taxes, net of federal tax benefit	0.50%	0.10%	0.30%
TCJA Adjustment	0	0	0.090
Change in valuation allowance	3.50%	1.90%	(6.50%)
Other differences, net	(3.50%)	(1.90%)	(2.50%)
Effective tax rate	0.50%	0.10%	0.30%

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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