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Income Taxes (Income Tax Reconciliation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at statutory rates | $ 16,409,000 | $ 17,710,000 | $ 19,851,000
Increase (reduction) from: |  |  |
Jurisdictional rate differences | 1,034,000 | 988,000 | 719,000
Valuation allowance | (63,000) | 460,000 | (267,000)
Stock based compensation | (366,000) | (358,000) | (205,000)
U.S. state taxes | 2,450,000 | 3,125,000 | 3,917,000
Foreign tax expense | 704,000 | 0 | 0
R&D credit | (415,000) | (699,000) | (531,000)
GILTI | 50,000 | 872,000 | 673,000
Previously unrecognized tax (benefit)/expense | 2,219,000 | (1,504,000) | 0
Other, net | (515,000) | 835,000 | 219,000
Provision for income taxes before tax reform | $ 21,507,000 | $ 21,429,000 | $ 24,376,000
Effective tax rate before effects of tax reform | 28.00% | 25.00% | 26.00%
Tax Reform: |  |  |
Rate change of deferreds | $ 0 | $ 0 | $ 1,200,000
Transition tax on deemed repatriation | 0 | 0 | (4,531,000)
Impact of tax reform | 0 | 0 | (3,331,000)
Provision for income tax | $ 21,507,000 | $ 21,429,000 | $ 21,045,000
Effective tax rate | 28.00% | 25.00% | 22.00%

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