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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS - Employee benefit plan amounts recognized in the Consolidated Balance Sheets and Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Retirement Benefits [Abstract]
Service cost	$ 1,238	$ 1,308	$ 3,715	$ 3,925
Interest cost	589	581	1,767	1,743
Expected return on plan assets	(2,481)	(2,431)	(7,443)	(7,294)
Amortization of prior service cost	(103)	(103)	(310)	(310)
Defined Benefit Plan, Amortization of Gain (Loss)	438	420	1,315	1,261
Net periodic benefit cost (income)	$ (319)	$ (225)	$ (956)	$ (675)

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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