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Income Taxes (Reconciliation of the Federal Statutory and Effective Income Tax Rate) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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