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INCOME TAXES - Reconciliation between the federal statutory rate and effective tax rate (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INCOME TAXES
Federal statutory rate	34.00%	34.00%	34.00%
State income taxes, net of federal benefit	0.70%	0.50%	0.80%
Research and experimentation credit	(4.90%)		(0.20%)
Tax-exempt interest	(1.40%)	(2.30%)	(3.00%)
Tax-exempt (gain) loss on SERP assets	(1.20%)	(0.60%)	0.20%
Tax-exempt gain -benefit plan financing			(8.40%)
Manufacturing deduction	(2.70%)	(3.00%)	(2.00%)
Change in valuation allowance	0.20%
Other	0.20%	(0.40%)	(1.50%)
Effective tax rate	24.90%	28.20%	19.90%

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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 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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