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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States
Change in benefit obligation:
Benefit obligation at beginning of year	$ 175,879	$ 160,995
Service cost	9,706	9,041	$ 10,016
Interest cost	7,010	6,776	6,355
Actuarial (gain) loss	21,085	4,278
Benefits paid	(15,230)	(5,211)
Benefit obligation at end of year	198,450	175,879	160,995
Change in plan assets:
Fair value of plan assets at beginning of year	126,246	112,934
Actual return on plan assets	18,372	8,414
Employer contribution	40,212	10,109
Benefits paid	(15,230)	(5,211)
Fair value of plan assets at end of year	169,600	126,246	112,934
Funded status at end of year				$ (28,850)	$ (49,633)
Funded status amounts recognized in Consolidated Balance Sheet
Current liabilities				(423)	(302)
Non-current liabilities				(28,427)	(49,331)
Funded status amount				(28,850)	(49,633)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss				58,260	48,872
Tax effects				(20,057)	(18,327)
Net amount recognized				38,203	30,545
Changes in benefit obligations and plan assets recognized in other comprehensive income
Current year actuarial gain (loss)	(12,593)	(4,335)	11,048
Amortization of net loss	3,205	3,283	5,404
Net amount recognized	(9,388)	(1,052)	16,452
Amounts in accumulated other comprehensive loss expected to be recognized as components of periodic benefit cost in next fiscal year
Amortization of net loss				4,657
Amount expected to be recognized in next fiscal year				4,657
Components of net periodic benefit cost:
Service cost	9,706	9,041	10,016
Interest cost	7,010	6,776	6,355
Expected return on plan assets	(9,880)	(8,471)	(7,590)
Amortization of net loss	3,205	3,283	5,404
Net periodic benefit cost	$ 10,041	$ 10,629	$ 14,185
Accumulated benefit obligation				178,900	159,400
Projected benefit obligation ("PBO"), ABO, and fair value of plan assets for all pension plans with an ABO in excess of plan assets
Projected benefit obligation				11,478	175,879
Accumulated benefit obligation				9,291	159,398
Fair value of plan assets				0	126,246
PBO, ABO, and fair value of plan assets for all pension plans with a PBO in excess of plan assets
Projected benefit obligation				198,450	175,879
Accumulated benefit obligation				178,878	159,398
Fair value of plan assets				$ 169,600	$ 126,246
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)				3.55%	4.05%	4.24%
Rate of compensation increase (as a percent)				4.00%	4.00%	4.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	4.05%	4.24%	3.83%
Expected long-term return on plan assets (as a percent)	7.00%	7.00%	7.00%
Rate of compensation increase (as a percent)	4.00%	4.00%	4.00%
Plan Assets:
Weighted-average asset allocations (as a percent)				100.00%	100.00%
Total Investments in Fair Value Hierarchy				$ 113,347	$ 77,778
Investments at Net Asset Value per Share				56,253	48,468
Total Investments	$ 126,246	$ 112,934	$ 112,934	169,600	126,246	$ 112,934
Minimum funding requirement	0
Expected contribution in next fiscal year				400
United States | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 21,644	$ 821
United States | Equity Securities
Plan Assets:
Weighted-average asset allocations (as a percent)				42.00%	48.00%
Target allocation (as a percent)				60.00%
Total Investments in Fair Value Hierarchy				$ 63,799	$ 54,013
United States | Fixed Income Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				25.00%	28.00%
Total Investments in Fair Value Hierarchy				$ 27,904	$ 22,944
United States | Hedge Fund
Plan Assets:
Weighted-average asset allocations (as a percent)				9.00%	11.00%
United States | Infrastructure
Plan Assets:
Weighted-average asset allocations (as a percent)				6.00%	7.00%
United States | Money market
Plan Assets:
Weighted-average asset allocations (as a percent)				13.00%	1.00%
United States | Fixed income securities and infrastructure
Plan Assets:
Target allocation (as a percent)				40.00%
United States | Real Estate Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				5.00%	5.00%
United States | Level 1
Change in plan assets:
Fair value of plan assets at beginning of year	77,778
Fair value of plan assets at end of year	113,347	77,778
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 113,347	$ 77,778
Total Investments	77,778	77,778		113,347	77,778
United States | Level 1 | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				21,644	821
United States | Level 1 | Cash and Short Term Securities | USD
Plan Assets:
Total Investments in Fair Value Hierarchy				21,644	821
United States | Level 1 | Equity Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				63,799	54,013
United States | Level 1 | US Large Cap Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				37,456	32,672
United States | Level 1 | US Small Cap Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				7,569	5,929
United States | Level 1 | International Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				18,774	15,412
United States | Level 1 | Fixed Income Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				27,904	22,944
Foreign Plans
Change in benefit obligation:
Benefit obligation at beginning of year	93,178	84,807
Service cost	5,526	4,556	4,570
Interest cost	1,747	1,892	1,654
Prior service cost	1,419	655
Actuarial (gain) loss	(2,653)	6,663
Benefits paid	(3,489)	(2,244)
Foreign currency translation adjustment	13,302	(3,151)
Benefit obligation at end of year	109,030	93,178	84,807
Change in plan assets:
Fair value of plan assets at beginning of year	61,912	58,517
Actual return on plan assets	2,472	2,168
Employer contribution	3,824	5,209
Benefits paid	(3,489)	(2,244)
Foreign currency translation adjustment	8,665	(1,738)
Fair value of plan assets at end of year	73,384	61,912	58,517
Funded status at end of year				(35,646)	(31,266)
Funded status amounts recognized in Consolidated Balance Sheet
Non-current assets				297	170
Current liabilities				(9)
Non-current liabilities				(35,934)	(31,436)
Funded status amount				(35,646)	(31,266)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss				33,703	38,550
Net prior service cost				5,341	4,342
Tax effects				(12,651)	(13,661)
Net amount recognized				26,393	29,231
Changes in benefit obligations and plan assets recognized in other comprehensive income
Current year actuarial gain (loss)	2,952	(6,251)	568
Current year prior service cost	(1,399)	(656)	(821)
Amortization of net loss	1,895	1,540	1,812
Amortization of prior service cost	400	350	256
Net amount recognized	3,848	(5,017)	1,815
Amounts in accumulated other comprehensive loss expected to be recognized as components of periodic benefit cost in next fiscal year
Amortization of net loss				1,744
Amortization of prior service cost				504
Amount expected to be recognized in next fiscal year				2,248
Components of net periodic benefit cost:
Service cost	5,526	4,556	4,570
Interest cost	1,747	1,892	1,654
Expected return on plan assets	(2,409)	(2,181)	(1,792)
Amortization of net loss	1,895	1,540	1,676
Amortization of prior service cost	400	350	256
Net periodic benefit cost	7,159	6,157	6,364
Settlement			136
Total net periodic benefit cost	$ 7,159	$ 6,157	$ 6,500
Accumulated benefit obligation				84,700	71,600
Projected benefit obligation ("PBO"), ABO, and fair value of plan assets for all pension plans with an ABO in excess of plan assets
Projected benefit obligation				89,618	84,517
Accumulated benefit obligation				65,524	62,913
Fair value of plan assets				54,052	53,082
PBO, ABO, and fair value of plan assets for all pension plans with a PBO in excess of plan assets
Projected benefit obligation				84,799	84,517
Accumulated benefit obligation				59,383	62,913
Fair value of plan assets				$ 49,233	$ 53,082
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)				1.62%	1.65%	2.10%
Rate of compensation increase (as a percent)				3.02%	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	1.65%	2.10%	1.90%
Expected long-term return on plan assets (as a percent)	3.66%	3.66%	3.54%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Plan Assets:
Weighted-average asset allocations (as a percent)				100.00%	100.00%
Total Investments in Fair Value Hierarchy				$ 73,384	$ 61,912
Total Investments	$ 61,912	$ 58,517	$ 58,517	73,384	61,912	$ 58,517
Expected contribution in next fiscal year				3,100
Foreign Plans | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 432	$ 1,585
Foreign Plans | Equity Securities
Plan Assets:
Weighted-average asset allocations (as a percent)				4.00%	4.00%
Total Investments in Fair Value Hierarchy				$ 3,111	$ 2,539
Foreign Plans | Fixed Income Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				1.00%	1.00%
Total Investments in Fair Value Hierarchy				$ 779	$ 680
Foreign Plans | Corporate debts securities
Plan Assets:
Weighted-average asset allocations (as a percent)				3.00%	3.00%
Total Investments in Fair Value Hierarchy				$ 2,256	$ 1,725
Foreign Plans | Investment Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				91.00%	89.00%
Target allocation (as a percent)				100.00%
Total Investments in Fair Value Hierarchy				$ 66,807	$ 55,383
Foreign Plans | Money market
Plan Assets:
Weighted-average asset allocations (as a percent)				1.00%	3.00%
Foreign Plans | Level 1
Change in plan assets:
Fair value of plan assets at beginning of year	27,611
Fair value of plan assets at end of year	31,387	27,611
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 31,387	$ 27,611
Total Investments	27,611	27,611		31,387	27,611
Foreign Plans | Level 1 | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				432	1,585
Foreign Plans | Level 1 | Cash and Short Term Securities | EUR
Plan Assets:
Total Investments in Fair Value Hierarchy				432	1,585
Foreign Plans | Level 1 | Equity Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				3,111	2,539
Foreign Plans | Level 1 | International Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				3,111	2,539
Foreign Plans | Level 1 | Fixed Income Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				779	680
Foreign Plans | Level 1 | Corporate debts securities
Plan Assets:
Total Investments in Fair Value Hierarchy				2,256	1,725
Foreign Plans | Level 1 | Euro Corporate Bonds
Plan Assets:
Total Investments in Fair Value Hierarchy				2,256	1,725
Foreign Plans | Level 1 | Investment Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				24,810	21,082
Foreign Plans | Level 1 | Mutual Funds in Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				4,356	3,393
Foreign Plans | Level 1 | Mutual Funds in Bonds
Plan Assets:
Total Investments in Fair Value Hierarchy				19,639	17,027
Foreign Plans | Level 1 | Mutual Funds Diversified
Plan Assets:
Total Investments in Fair Value Hierarchy				815	662
Foreign Plans | Level 2
Change in plan assets:
Fair value of plan assets at beginning of year	34,301
Fair value of plan assets at end of year	41,997	34,301
Plan Assets:
Total Investments in Fair Value Hierarchy				41,997	34,301
Total Investments	$ 34,301	$ 34,301		41,997	34,301
Foreign Plans | Level 2 | Investment Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				41,997	34,301
Foreign Plans | Level 2 | Mutual Funds Diversified
Plan Assets:
Total Investments in Fair Value Hierarchy				41,997	34,301
Non-qualified supplemental pension plan
Non-qualified supplemental pension plan information
Non funded liability				$ 11,500	$ 9,600

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The tax effects on net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation before adjustment for gain (loss) due to settlements or curtailments.

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If aggregate disclosures are presented, the aggregate accumulated benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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