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INCOME TAXES - Reconciliation between the federal statutory rate and effective tax rate (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCOME TAXES
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	1.10%	0.70%	0.80%
Research and experimentation credit	(0.80%)	(1.00%)	(1.10%)
Tax-exempt interest	(0.20%)	(0.40%)	(0.40%)
Tax-exempt gain on SERP assets	(0.60%)	(1.30%)	(0.10%)
Manufacturing deduction	(3.00%)	(3.00%)	(2.50%)
Change in valuation allowance	(0.10%)	(1.40%)	0.00%
Adjustments related to the Act	5.60%	0.00%	0.00%
Adjustments related to vesting of restricted stock	(2.40%)	0.00%	0.00%
Other	1.00%	(0.10%)	0.00%
Effective tax rate	35.60%	28.50%	31.70%

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Percentage of adjustments related to vesting of restricted stock.

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This element represents percentage of exempt tax on gain or loss of supplemental executive retirement Plan assets.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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