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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Domestic Plans
Change in benefit obligation:
Benefit obligation at beginning of year	$ 160,995	$ 171,501
Service cost	9,041	10,016	$ 8,042
Interest cost	6,776	6,355	5,928
Actuarial (gain) loss	4,278	(19,568)
Benefits paid	(5,211)	(7,309)
Benefit obligation at end of year	175,879	160,995	171,501
Change in plan assets:
Fair value of plan assets at beginning of year	112,934	111,094
Actual return on plan assets	8,414	(930)
Employer contribution	10,109	10,079
Benefits paid	(5,211)	(7,309)
Fair value of plan assets at end of year	126,246	112,934	111,094
Funded status at end of year				$ (49,633)		$ (48,060)
Funded status amounts recognized in Consolidated Balance Sheet
Current liabilities				(302)		(173)
Non-current liabilities				(49,331)		(47,887)
Funded status amount				(49,633)		(48,060)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss				48,872		47,820
Tax effects				(18,327)		(17,933)
Net amount recognized				30,545		29,887
Changes in benefit obligations and plan assets recognized in other comprehensive income
Current year actuarial gain (loss)	(4,335)	11,048	(34,211)
Amortization of net loss	3,283	5,404	2,869
Net amount recognized	(1,052)	16,452	(31,342)
Amounts in accumulated other comprehensive loss expected to be recognized as components of periodic benefit cost in 2017
Amortization of net loss	2,973
Amount expected to be recognized in next fiscal year	2,973
Components of net periodic benefit cost:
Service cost	9,041	10,016	8,042
Interest cost	6,776	6,355	5,928
Expected return on plan assets	(8,471)	(7,590)	(6,585)
Amortization of net loss	3,283	5,404	2,869
Net periodic benefit cost	$ 10,629	$ 14,185	$ 10,254
Accumulated benefit obligation				159,400		145,500
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				175,879		160,995
Accumulated benefit obligation				159,398		145,482
Fair value of plan assets				126,246		112,934
PBO, ABO, and fair value of plan assets for all pension plans with a PBO in excess of plan assets
Projected benefit obligation				175,879		160,995
Accumulated benefit obligation				159,398		145,482
Fair value of plan assets				$ 126,246		$ 112,934
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)				4.05%	4.24%	4.24%	3.83%
Rate of compensation increase (as a percent)				4.00%	4.00%	4.00%	4.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	4.24%	3.83%	4.75%
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%	100.00%
Total Investments in Fair Value Hierarchy				$ 77,778		$ 70,832
Investments at Net Asset Value per Share				48,468		42,102
Total Investments	$ 112,934	$ 111,094	$ 111,094	126,246		112,934	$ 111,094
Minimum funding requirement	0
Expected contribution in next fiscal year	$ 10,300
Domestic Plans | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 821		$ 1,189
Domestic Plans | Equity Securities
Plan Assets:
Weighted-average asset allocations (as a percent)				48.00%	47.00%	47.00%
Target allocation (as a percent)	60.00%
Total Investments in Fair Value Hierarchy				$ 54,013		$ 47,725
Domestic Plans | Fixed Income Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				28.00%	30.00%	30.00%
Total Investments in Fair Value Hierarchy				$ 22,944		$ 21,918
Domestic Plans | Hedge Fund
Plan Assets:
Weighted-average asset allocations (as a percent)				11.00%	14.00%	14.00%
Domestic Plans | Infrastructure
Plan Assets:
Weighted-average asset allocations (as a percent)				7.00%	8.00%	8.00%
Domestic Plans | Money market
Plan Assets:
Weighted-average asset allocations (as a percent)				1.00%	1.00%	1.00%
Domestic Plans | Fixed income securities and infrastructure
Plan Assets:
Target allocation (as a percent)	40.00%
Domestic Plans | Real Estate Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				5.00%
Domestic Plans | Level 1
Change in plan assets:
Fair value of plan assets at beginning of year	$ 70,832
Fair value of plan assets at end of year	77,778	70,832
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 77,778		$ 70,832
Total Investments	70,832	70,832		77,778		70,832
Domestic Plans | Level 1 | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				821		1,189
Domestic Plans | Level 1 | Cash and Short Term Securities | USD
Plan Assets:
Total Investments in Fair Value Hierarchy				821		1,189
Domestic Plans | Level 1 | Equity Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				54,013		47,725
Domestic Plans | Level 1 | US Large Cap Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				32,672		28,797
Domestic Plans | Level 1 | US Small Cap Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				5,929		5,349
Domestic Plans | Level 1 | International Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				15,412		13,579
Domestic Plans | Level 1 | Fixed Income Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				22,944		21,918
Foreign Plans
Change in benefit obligation:
Benefit obligation at beginning of year	84,807	91,160
Service cost	4,556	4,570	4,186
Interest cost	1,892	1,654	2,711
Curtailment/Settlement		(227)
Prior service cost	655	821
Actuarial (gain) loss	6,663	(1,486)
Benefits paid	(2,244)	(2,265)
Foreign currency translation adjustment	(3,151)	(9,420)
Benefit obligation at end of year	93,178	84,807	91,160
Change in plan assets:
Fair value of plan assets at beginning of year	58,517	55,394
Actual return on plan assets	2,168	927
Employer contribution	5,209	10,157
Benefits paid	(2,244)	(2,265)
Foreign currency translation adjustment	(1,738)	(5,696)
Fair value of plan assets at end of year	61,912	58,517	55,394
Funded status at end of year				(31,266)		(26,288)
Funded status amounts recognized in Consolidated Balance Sheet
Non-current liabilities				(31,266)		(26,288)
Funded status amount				(31,266)		(26,288)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss				38,550		33,839
Net prior service cost				4,342		4,036
Tax effects				(13,661)		(12,211)
Net amount recognized				29,231		25,664
Changes in benefit obligations and plan assets recognized in other comprehensive income
Current year actuarial gain (loss)	(6,251)	568	(12,589)
Current year prior service cost	(656)	(821)
Amortization of net loss	1,540	1,812	1,214
Amortization of prior service cost	350	256	313
Net amount recognized	(5,017)	1,815	(11,062)
Amounts in accumulated other comprehensive loss expected to be recognized as components of periodic benefit cost in 2017
Amortization of net loss	1,766
Amortization of prior service cost	373
Amount expected to be recognized in next fiscal year	2,139
Components of net periodic benefit cost:
Service cost	4,556	4,570	4,186
Interest cost	1,892	1,654	2,711
Expected return on plan assets	(2,181)	(1,792)	(1,979)
Amortization of net loss	1,540	1,676	1,214
Amortization of prior service cost	350	256	313
Net periodic benefit cost	6,157	6,364	6,445
Settlement		136
Total net periodic benefit cost	$ 6,157	$ 6,500	$ 6,445
Accumulated benefit obligation				71,600		65,500
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				84,517		81,343
Accumulated benefit obligation				62,913		61,990
Fair value of plan assets				53,082		55,054
PBO, ABO, and fair value of plan assets for all pension plans with a PBO in excess of plan assets
Projected benefit obligation				84,517		81,343
Accumulated benefit obligation				62,913		61,990
Fair value of plan assets				$ 53,082		$ 55,054
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)				1.65%	2.10%	2.10%	1.90%
Rate of compensation increase (as a percent)				3.00%	3.00%	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	2.10%	1.90%	3.24%
Expected long-term return on plan assets (as a percent)	3.66%	3.54%	3.79%
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%	100.00%
Total Investments in Fair Value Hierarchy				$ 61,912		$ 58,517
Total Investments	$ 58,517	$ 55,394	$ 55,394	61,912		58,517	$ 55,394
Expected contribution in next fiscal year	$ 2,500
Foreign Plans | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 1,585		$ 1,907
Foreign Plans | Equity Securities
Plan Assets:
Weighted-average asset allocations (as a percent)				4.00%	4.00%	4.00%
Total Investments in Fair Value Hierarchy				$ 2,539		$ 2,258
Foreign Plans | Fixed Income Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				1.00%	1.00%	1.00%
Total Investments in Fair Value Hierarchy				$ 680		$ 559
Foreign Plans | Corporate debts securities
Plan Assets:
Weighted-average asset allocations (as a percent)				3.00%	3.00%	3.00%
Total Investments in Fair Value Hierarchy				$ 1,725		$ 1,542
Foreign Plans | Investment Funds
Plan Assets:
Weighted-average asset allocations (as a percent)				89.00%	89.00%	89.00%
Target allocation (as a percent)	100.00%
Total Investments in Fair Value Hierarchy				$ 55,383		$ 52,251
Foreign Plans | Money market
Plan Assets:
Weighted-average asset allocations (as a percent)				3.00%	3.00%	3.00%
Foreign Plans | Level 1
Change in plan assets:
Fair value of plan assets at beginning of year	$ 25,712
Fair value of plan assets at end of year	27,611	25,712
Plan Assets:
Total Investments in Fair Value Hierarchy				$ 27,611		$ 25,712
Total Investments	25,712	25,712		27,611		25,712
Foreign Plans | Level 1 | Cash and Short Term Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				1,585		1,907
Foreign Plans | Level 1 | Cash and Short Term Securities | EUR
Plan Assets:
Total Investments in Fair Value Hierarchy				1,585	€ 1,907
Foreign Plans | Level 1 | Equity Securities
Plan Assets:
Total Investments in Fair Value Hierarchy				2,539		2,258
Foreign Plans | Level 1 | International Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				2,539		2,258
Foreign Plans | Level 1 | Fixed Income Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				680		559
Foreign Plans | Level 1 | Corporate debts securities
Plan Assets:
Total Investments in Fair Value Hierarchy				1,725		1,542
Foreign Plans | Level 1 | Euro Corporate Bonds
Plan Assets:
Total Investments in Fair Value Hierarchy				1,725		1,542
Foreign Plans | Level 1 | Investment Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				21,082		19,446
Foreign Plans | Level 1 | Mutual Funds in Equities
Plan Assets:
Total Investments in Fair Value Hierarchy				3,393		3,392
Foreign Plans | Level 1 | Mutual Funds in Bonds
Plan Assets:
Total Investments in Fair Value Hierarchy				17,027		15,501
Foreign Plans | Level 1 | Mutual Funds Diversified
Plan Assets:
Total Investments in Fair Value Hierarchy				662		553
Foreign Plans | Level 2
Change in plan assets:
Fair value of plan assets at beginning of year	32,805
Fair value of plan assets at end of year	34,301	32,805
Plan Assets:
Total Investments in Fair Value Hierarchy				34,301		32,805
Total Investments	$ 32,805	$ 32,805		34,301		32,805
Foreign Plans | Level 2 | Investment Funds
Plan Assets:
Total Investments in Fair Value Hierarchy				34,301		32,805
Foreign Plans | Level 2 | Mutual Funds Diversified
Plan Assets:
Total Investments in Fair Value Hierarchy				34,301		32,805
Non-qualified supplemental pension plan
Non-qualified supplemental pension plan information
Non funded liability				$ 9,600		$ 8,400

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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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Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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No definition available.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contributions made by the employer to defined benefit plans.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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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, and gain (loss) due to settlements or curtailments.

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

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

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

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If aggregate disclosures are presented, the aggregate 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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