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Income Taxes (Statutory Tax Rate and Effective Tax Rate) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Statutory federal tax $ 14,114 $ 9,493 $ 10,381
State income taxes, net of federal benefit 446 797 414
Foreign Taxes (77) 3 15
Domestic manufacturer deduction (870) (920) (824)
Share-based compensation (1,191)    
Other permanent differences 147 41 4
Research and development and jobs credits   (163) (247)
Effect of Federal tax law change (222)    
Other state income tax benefits     114
Other 258 36 247
Income Tax Expense (Benefit), Total $ 12,605 $ 9,287 $ 10,104
Effective tax rate, Statutory federal tax 35.00% 35.00% 35.00%
Effective tax rate, State income taxes, net of federal benefit 1.10% 2.90% 1.40%
Effective Income Tax Rate Reconciliation, Foreign Taxes (0.20%) 0.00% 0.10%
Effective tax rate, Domestic manufacturer deduction (2.20%) (3.40%) (2.80%)
Effective tax rate, Share-based compensation (3.00%) 0.00% 0.00%
Effective tax rate, Other permanent differences 0.40% 0.20% 0.00%
Effective tax rate, Research and development and jobs credits (0.00%) (0.60%) (0.80%)
Effective tax rate, Effect of Federal tax law change (0.60%) 0.00% 0.00%
Effective tax rate, Other state income tax benefits 0.00% 0.00% 0.40%
Effective tax rate, Other 0.80% 0.10% 0.80%
Effective tax rate, Total 31.30% 34.20% 34.10%