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Income Taxes (Income Tax Reconciliation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Domestic statutory rate at 35% | $ 19,851,000 | $ 28,828,000 | $ 21,766,000
Increase (reduction) from: |  |  |
Jurisdictional rate differences | 719,000 | (1,863,000) | (1,936,000)
Valuation allowance | (267,000) | 308,000 | 1,731,000
Stock based compensation | (205,000) | (778,000) | 275,000
U.S. state taxes | 3,917,000 | 2,463,000 | 1,295,000
Domestic production deduction | 0 | (1,039,000) | (618,000)
R&D credit | (531,000) | (500,000) | (329,000)
GILTI | 673,000 | 0 | 0
Other, net | 219,000 | 397,000 | (40,000)
Provision for income taxes before tax reform | 24,376,000 | 27,816,000 | 22,144,000
Tax Reform: |  |  |
Rate change of deferreds | 1,200,000 | (3,334,000) | 0
Transition tax on deemed repatriation | (4,531,000) | 13,104,000 | 0
Other | 0 | 466,000 | 0
Impact of tax reform | (3,331,000) | 10,236,000 | 0
Total income taxes | $ 21,045,000 | $ 38,052,000 | $ 22,144,000
Effective tax rate | 26.00% | 34.00% |
Effective tax rate | 22.00% | 46.00% | 36.00%

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