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Income Taxes (Statutory Tax Rate and Effective Tax Rate) (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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