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Income Taxes (Income Tax Reconciliation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense at statutory rates | $ 17,710,000 | $ 19,851,000 | $ 28,828,000 |
Increase (reduction) from: |  |  |  |
Jurisdictional rate differences | 988,000 | 719,000 | (1,863,000) |
Valuation allowance | 460,000 | (267,000) | 308,000 |
Stock based compensation | (358,000) | (205,000) | (778,000) |
U.S. state taxes | 3,125,000 | 3,917,000 | 2,463,000 |
Domestic production deduction | 0 | 0 | (1,039,000) |
R&D credit | (699,000) | (531,000) | (500,000) |
GILTI | 872,000 | 673,000 | 0 |
FIN 48 at acquisition | (1,504,000) | 0 | 0 |
Other, net | 835,000 | 219,000 | 397,000 |
Provision for income taxes before tax reform | $ 21,429,000 | $ 24,376,000 | 27,816,000 |
Effective tax rate before effects of tax reform | 25.00% | 26.00% |  | 34.00%
Tax Reform: |  |  |  |
Rate change of deferreds | $ 0 | $ 1,200,000 | (3,334,000) |
Transition tax on deemed repatriation | 0 | (4,531,000) | 13,104,000 |
Other | 0 | 0 | 466,000 |
Impact of tax reform | 0 | (3,331,000) | 10,236,000 |
Provision for income tax | $ 21,429,000 | $ 21,045,000 | $ 38,052,000 |
Effective tax rate | 25.00% | 22.00% | 46.00% |

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