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Income Taxes (Income Tax Reconciliation) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory percentage rate | 35.00% | 35.00% | 35.00%
Domestic statutory rate at 35% | $ 28,828,000 | $ 21,766,000 | $ 23,403,000
Increase (reduction) from: |  |  |
Jurisdictional rate differences | (1,863,000) | (1,936,000) | (2,192,000)
Valuation allowance | 308,000 | 1,731,000 | 797,000
Stock based compensation | (778,000) | 275,000 | 257,000
U.S. state taxes | 2,463,000 | 1,295,000 | 1,942,000
Domestic production deduction | (1,039,000) | (618,000) | (518,000)
R&D credit | (500,000) | (329,000) | (475,000)
Other, net | 397,000 | (40,000) | 444,000
Provision for income taxes before tax reform | 27,816,000 |  |
Tax Reform: |  |  |
Rate change of deferreds | (3,334,000) | 0 | 0
Mandatory deemed repatriation expense | 13,104,000 | 0 | 0
Other | 466,000 | 0 | 0
Impact of tax reform | 10,236,000 | 0 | 0
Total income taxes | $ 38,052,000 | $ 22,144,000 | $ 23,658,000
Effective tax rate | 34.00% |  |
Effective tax rate | 46.00% | 36.00% | 35.00%

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