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Income Taxes (Reconciliation of the Federal Statutory and Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income before income tax provision	$ 43,399	$ 42,163
Statutory taxes at 21.0%	9,114	8,854
State and local income taxes	1,129	1,241
Non-deductible expenses	736	663
Percentage depletion	(4,451)	(4,199)
R&D and other federal credits	(255)	(37)
Settlements	(2,377)	323
Other, net	(129)	533
Income tax provision	$ 3,767	$ 7,378
Effective income tax rate	8.70%	17.50%

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Income Tax Reconciliation, Research and Development and Other Federal Credits

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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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