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Income Taxes (Statutory Tax Rate and Effective Tax Rate) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |
Statutory federal tax | $ 9,493 | $ 10,381 | $ 11,093
State income taxes, net of federal benefit | 797 | 414 | 314
Foreign Taxes | 3 | 15 | 73
Domestic manufacturer deduction | (920) | (824) | (811)
Other permanent differences | 41 | 4 | 200
Research and development and jobs credits | (163) | (247) | (203)
Other state income tax benefits |  | 114 | (113)
Other | 36 | 247 | 111
Income Tax Expense (Benefit), Total | $ 9,287 | $ 10,104 | $ 10,664
Effective tax rate, Statutory federal tax | 35.00% | 35.00% | 35.00%
Effective tax rate, State income taxes, net of federal benefit | 2.90% | 1.40% | 1.00%
Effective Income Tax Rate Reconciliation, Foreign Taxes | 0.00% | 0.10% | 0.20%
Effective tax rate, Domestic manufacturer deduction | (3.40%) | (2.80%) | (2.60%)
Effective tax rate, Other permanent differences | 0.20% | 0.00% | 0.60%
Effective tax rate, Research and development and jobs credits | (0.60%) | (0.80%) | (0.60%)
Effective tax rate, Other state income tax benefits | 0.00% | 0.40% | (0.40%)
Effective tax rate, Other | 0.10% | 0.80% | 0.40%
Effective tax rate, Total | 34.20% | 34.10% | 33.60%

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