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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Revision of Prior Period Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retirement and deferred compensation plan liabilities	$ (5,381)	$ (24,069)
Net Cash Provided by Operations	51,019	38,176
Proceeds from stock option exercises	34,880	18,705
Net Cash Provided (Used) by Financing Activities	$ 1,625	(183,184)
Original Balance
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retirement and deferred compensation plan liabilities		(21,272)
Net Cash Provided by Operations		40,973
Proceeds from stock option exercises		15,908
Net Cash Provided (Used) by Financing Activities		(185,981)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Retirement and deferred compensation plan liabilities		(2,797)
Net Cash Provided by Operations		(2,797)
Proceeds from stock option exercises		2,797
Net Cash Provided (Used) by Financing Activities		$ 2,797

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Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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