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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 21, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes.
Federal income tax rate	35.00%	21.00%	21.00%	35.00%
Effective tax rates		27.41%	25.43%	46.04%
Reduction in deferred tax asset		$ 14,600
Net deferred tax assets		29,800	$ 33,300
Operating loss carryforward		$ 718
Operating loss carryforward date		Dec. 31, 2027

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

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