RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Level 3 | Infrastructure
Change in plan assets:
Fair value of plan assets at end of year	$ 8,931,000	$ 8,587,000	$ 8,015,000
Plan Assets:
Total Investments	8,931,000	8,587,000	8,015,000
Level 3 | Hedge Fund
Change in plan assets:
Fair value of plan assets at end of year	272,000	9,731,000	8,575,000
Plan Assets:
Total Investments	272,000	9,731,000	8,575,000
Domestic Plans
Change in benefit obligation:
Benefit obligation at beginning of year	129,448,000	136,321,000
Service cost	8,042,000	8,539,000	7,217,000
Interest cost	5,928,000	4,992,000	4,913,000
Actuarial (gain) loss	33,058,000	(14,260,000)
Benefits paid	(4,975,000)	(6,144,000)
Benefit obligation at end of year	171,501,000	129,448,000	136,321,000
Change in plan assets:
Fair value of plan assets at beginning of year	100,567,000	84,587,000
Actual return on plan assets	5,431,000	12,063,000
Employer contribution	10,071,000	10,061,000
Benefits paid	(4,975,000)	(6,144,000)
Fair value of plan assets at end of year	111,094,000	100,567,000	84,587,000
Funded status at end of year	(60,407,000)	(28,881,000)
Funded status amounts recognized in Consolidated Balance Sheet
Current liabilities	(471,000)	(809,000)
Non-current liabilities	(59,936,000)	(28,072,000)
Funded status amount	(60,407,000)	(28,881,000)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss	64,272,000	32,930,000
Tax effects	(24,102,000)	(12,349,000)
Net amount recognized	40,170,000	20,581,000
Changes in benefit obligations and plan assets recognized in other comprehensive income
Current year actuarial loss	(34,211,000)
Amortization of net loss	2,869,000
Net amount recognized	(31,342,000)
Amounts in accumulated other comprehensive loss expected to be recognized as components of periodic benefit cost in 2015
Amortization of net loss	5,536,000
Amount expected to be recognized in next fiscal year	5,536,000
Components of net periodic benefit cost:
Service cost	8,042,000	8,539,000	7,217,000
Interest cost	5,928,000	4,992,000	4,913,000
Expected return on plan assets	(6,585,000)	(5,775,000)	(5,604,000)
Amortization of net loss	2,869,000	5,103,000	3,854,000
Amortization of prior service cost		3,000	4,000
Net periodic benefit cost	10,254,000	12,862,000	10,384,000
Total net periodic benefit cost	10,254,000	12,862,000	10,384,000
Accumulated benefit obligation	153,800,000	114,600,000
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	171,501,000	129,448,000
Accumulated benefit obligation	153,778,000	114,592,000
Fair value of plan assets	111,094,000	100,567,000
PBO, ABO, and fair value of plan assets for all pension plans with a PBO in excess of plan assets
Projected benefit obligation	171,501,000	129,448,000
Accumulated benefit obligation	153,778,000	114,592,000
Fair value of plan assets	111,094,000	100,567,000
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	3.83%	4.75%	3.80%
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)	4.75%	3.80%	4.40%
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	111,094,000	100,567,000	84,587,000
Minimum funding requirement	0
Expected contribution in next fiscal year	10,000,000
Estimated benefit payments relating to defined benefit plans over the next ten years
2015	6,777,000
2016	8,275,000
2017	8,925,000
2018	9,436,000
2019	9,617,000
2020 - 2024	62,132,000
Domestic Plans | Cash and Short Term Securities
Change in plan assets:
Fair value of plan assets at end of year	3,190,000	9,070,000
Plan Assets:
Total Investments	3,190,000	9,070,000
Domestic Plans | Equity Securities
Change in plan assets:
Fair value of plan assets at beginning of year	49,261,000
Fair value of plan assets at end of year	52,840,000
Plan Assets:
Weighted-average asset allocations (as a percent)	47.00%	49.00%
Target allocation (as a percent)	60.00%
Total Investments	52,840,000
Domestic Plans | Fixed Income Securities
Plan Assets:
Weighted-average asset allocations (as a percent)	27.00%	24.00%
Domestic Plans | Infrastructure
Change in plan assets:
Fair value of plan assets at end of year	8,931,000	8,587,000
Plan Assets:
Weighted-average asset allocations (as a percent)	8.00%	8.00%
Total Investments	8,931,000	8,587,000
Domestic Plans | Hedge Fund
Change in plan assets:
Fair value of plan assets at end of year	16,371,000	9,731,000
Plan Assets:
Weighted-average asset allocations (as a percent)	15.00%	10.00%
Total Investments	16,371,000	9,731,000
Domestic Plans | Money market
Plan Assets:
Weighted-average asset allocations (as a percent)	3.00%	9.00%
Domestic Plans | Fixed income securities and infrastructure
Plan Assets:
Target allocation (as a percent)	40.00%
Domestic Plans | Core Fixed Income
Change in plan assets:
Fair value of plan assets at end of year	29,762,000	23,918,000
Plan Assets:
Total Investments	29,762,000	23,918,000
Domestic Plans | Level 1
Change in plan assets:
Fair value of plan assets at end of year	75,743,000	82,249,000
Plan Assets:
Total Investments	75,743,000	82,249,000
Domestic Plans | Level 1 | Cash and Short Term Securities
Change in plan assets:
Fair value of plan assets at end of year	3,190,000	9,070,000
Plan Assets:
Total Investments	3,190,000	9,070,000
Domestic Plans | Level 1 | Cash and Short Term Securities | USD
Change in plan assets:
Fair value of plan assets at end of year	3,190,000	9,070,000
Plan Assets:
Total Investments	3,190,000	9,070,000
Domestic Plans | Level 1 | Equity Securities
Change in plan assets:
Fair value of plan assets at end of year	52,840,000	49,261,000
Plan Assets:
Total Investments	52,840,000	49,261,000
Domestic Plans | Level 1 | US Large Cap Equities
Change in plan assets:
Fair value of plan assets at end of year	29,381,000	20,159,000
Plan Assets:
Total Investments	29,381,000	20,159,000
Domestic Plans | Level 1 | US Small Cap Equities
Change in plan assets:
Fair value of plan assets at end of year	8,493,000	14,521,000
Plan Assets:
Total Investments	8,493,000	14,521,000
Domestic Plans | Level 1 | International Equities
Change in plan assets:
Fair value of plan assets at end of year	14,966,000	14,581,000
Plan Assets:
Total Investments	14,966,000	14,581,000
Domestic Plans | Level 1 | Core Fixed Income
Change in plan assets:
Fair value of plan assets at end of year	19,713,000	23,918,000
Plan Assets:
Total Investments	19,713,000	23,918,000
Domestic Plans | Level 2
Change in plan assets:
Fair value of plan assets at end of year	26,148,000
Plan Assets:
Total Investments	26,148,000
Domestic Plans | Level 2 | Hedge Fund
Change in plan assets:
Fair value of plan assets at end of year	16,099,000
Plan Assets:
Total Investments	16,099,000
Domestic Plans | Level 2 | Core Fixed Income
Change in plan assets:
Fair value of plan assets at end of year	10,049,000
Plan Assets:
Total Investments	10,049,000
Domestic Plans | Level 3
Change in plan assets:
Fair value of plan assets at end of year	9,203,000	18,318,000
Plan Assets:
Total Investments	9,203,000	18,318,000
Domestic Plans | Level 3 | Infrastructure
Change in plan assets:
Fair value of plan assets at end of year	8,931,000	8,587,000
Plan Assets:
Total Investments	8,931,000	8,587,000
Domestic Plans | Level 3 | Hedge Fund
Change in plan assets:
Fair value of plan assets at end of year	272,000	9,731,000
Plan Assets:
Total Investments	272,000	9,731,000
Foreign Plans
Change in benefit obligation:
Benefit obligation at beginning of year	84,660,000	80,610,000
Service cost	4,186,000	3,901,000	2,244,000
Interest cost	2,711,000	2,676,000	2,658,000
Curtailment/Settlement		(1,342,000)
Actuarial (gain) loss	14,765,000	(1,752,000)
Benefits paid	(3,111,000)	(2,952,000)
Foreign currency translation adjustment	(12,051,000)	3,519,000
Benefit obligation at end of year	91,160,000	84,660,000	80,610,000
Change in plan assets:
Fair value of plan assets at beginning of year	54,075,000	47,876,000
Actual return on plan assets	2,875,000	1,742,000
Employer contribution	8,016,000	5,419,000
Benefits paid	(3,111,000)	(2,952,000)
Foreign currency translation adjustment	(6,461,000)	1,990,000
Fair value of plan assets at end of year	55,394,000	54,075,000	47,876,000
Funded status at end of year	(35,766,000)	(30,585,000)
Funded status amounts recognized in Consolidated Balance Sheet
Non-current liabilities	(35,766,000)	(30,585,000)
Funded status amount	(35,766,000)	(30,585,000)
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss	36,219,000	24,844,000
Net prior service cost	3,471,000	3,784,000
Tax effects	(12,762,000)	(9,116,000)
Net amount recognized	26,928,000	19,512,000
Changes in benefit obligations and plan assets recognized in other comprehensive income
Current year actuarial loss	(12,589,000)
Amortization of net loss	1,214,000
Amortization of prior service cost	313,000
Net amount recognized	(11,062,000)
Amounts in accumulated other comprehensive loss expected to be recognized as components of periodic benefit cost in 2015
Amortization of net loss	1,826,000
Amortization of prior service cost	279,000
Amount expected to be recognized in next fiscal year	2,105,000
Components of net periodic benefit cost:
Service cost	4,186,000	3,901,000	2,244,000
Interest cost	2,711,000	2,676,000	2,658,000
Expected return on plan assets	(1,979,000)	(1,821,000)	(1,538,000)
Amortization of net loss	1,214,000	1,416,000	475,000
Amortization of prior service cost	313,000	373,000	361,000
Net periodic benefit cost	6,445,000	6,545,000	4,200,000
Curtailment		1,000
Total net periodic benefit cost	6,445,000	6,546,000	4,200,000
Accumulated benefit obligation	70,700,000	67,000,000
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	87,759,000	77,475,000
Accumulated benefit obligation	67,317,000	60,707,000
Fair value of plan assets	51,993,000	47,753,000
PBO, ABO, and fair value of plan assets for all pension plans with a PBO in excess of plan assets
Projected benefit obligation	87,759,000	81,158,000
Accumulated benefit obligation	67,317,000	63,527,000
Fair value of plan assets	51,993,000	50,573,000
Weighted-average assumptions used to determine benefit obligations
Discount rate (as a percent)	1.90%	3.24%	3.19%
Rate of compensation increase (as a percent)	3.00%	3.00%	3.00%
Weighted-average assumptions used to determine net periodic benefit cost
Discount rate (as a percent)	3.24%	3.19%	5.10%
Expected long-term return on plan assets (as a percent)	3.79%	3.79%	3.83%
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	55,394,000	54,075,000	47,876,000
Expected contribution in next fiscal year	13,700,000
Estimated benefit payments relating to defined benefit plans over the next ten years
2015	1,951,000
2016	1,877,000
2017	2,470,000
2018	2,921,000
2019	4,569,000
2020 - 2024	22,853,000
Foreign Plans | Cash and Short Term Securities
Change in plan assets:
Fair value of plan assets at end of year	1,289,000	757,000
Plan Assets:
Total Investments	1,289,000	757,000
Foreign Plans | Equity Securities
Change in plan assets:
Fair value of plan assets at end of year	2,625,000	2,547,000
Plan Assets:
Weighted-average asset allocations (as a percent)	5.00%	5.00%
Total Investments	2,625,000	2,547,000
Foreign Plans | Fixed Income Securities
Plan Assets:
Weighted-average asset allocations (as a percent)	1.00%	4.00%
Foreign Plans | Corporate debts securities
Change in plan assets:
Fair value of plan assets at end of year	6,758,000	6,560,000
Plan Assets:
Weighted-average asset allocations (as a percent)	12.00%	12.00%
Total Investments	6,758,000	6,560,000
Foreign Plans | Money market
Plan Assets:
Weighted-average asset allocations (as a percent)	2.00%	1.00%
Target allocation (as a percent)	1.00%
Foreign Plans | Investment Funds
Change in plan assets:
Fair value of plan assets at beginning of year	42,261,000
Fair value of plan assets at end of year	44,148,000
Plan Assets:
Weighted-average asset allocations (as a percent)	80.00%	78.00%
Target allocation (as a percent)	99.00%
Total Investments	44,148,000
Foreign Plans | Core Fixed Income
Change in plan assets:
Fair value of plan assets at end of year	574,000	1,950,000
Plan Assets:
Total Investments	574,000	1,950,000
Foreign Plans | Level 1
Change in plan assets:
Fair value of plan assets at end of year	25,889,000	27,315,000
Plan Assets:
Total Investments	25,889,000	27,315,000
Foreign Plans | Level 1 | Cash and Short Term Securities
Change in plan assets:
Fair value of plan assets at end of year	1,289,000	757,000
Plan Assets:
Total Investments	1,289,000	757,000
Foreign Plans | Level 1 | Cash and Short Term Securities | EUR
Change in plan assets:
Fair value of plan assets at end of year	1,289,000	757,000
Plan Assets:
Total Investments	1,289,000	757,000
Foreign Plans | Level 1 | Equity Securities
Change in plan assets:
Fair value of plan assets at end of year	2,625,000	2,547,000
Plan Assets:
Total Investments	2,625,000	2,547,000
Foreign Plans | Level 1 | Corporate debts securities
Change in plan assets:
Fair value of plan assets at end of year	6,758,000	6,560,000
Plan Assets:
Total Investments	6,758,000	6,560,000
Foreign Plans | Level 1 | Investment Funds
Change in plan assets:
Fair value of plan assets at end of year	14,643,000	15,501,000
Plan Assets:
Total Investments	14,643,000	15,501,000
Foreign Plans | Level 1 | International Equities
Change in plan assets:
Fair value of plan assets at end of year	2,625,000	2,547,000
Plan Assets:
Total Investments	2,625,000	2,547,000
Foreign Plans | Level 1 | Core Fixed Income
Change in plan assets:
Fair value of plan assets at end of year	574,000	1,950,000
Plan Assets:
Total Investments	574,000	1,950,000
Foreign Plans | Level 1 | Euro Corporate Bonds
Change in plan assets:
Fair value of plan assets at end of year	6,758,000	6,560,000
Plan Assets:
Total Investments	6,758,000	6,560,000
Foreign Plans | Level 1 | Mutual Funds in Equities
Change in plan assets:
Fair value of plan assets at end of year	2,687,000	3,628,000
Plan Assets:
Total Investments	2,687,000	3,628,000
Foreign Plans | Level 1 | Mutual Funds in Bonds
Change in plan assets:
Fair value of plan assets at end of year	11,386,000	10,040,000
Plan Assets:
Total Investments	11,386,000	10,040,000
Foreign Plans | Level 1 | Mutual Funds Diversified
Change in plan assets:
Fair value of plan assets at end of year	570,000	1,833,000
Plan Assets:
Total Investments	570,000	1,833,000
Foreign Plans | Level 2
Change in plan assets:
Fair value of plan assets at end of year	29,505,000	26,760,000
Plan Assets:
Total Investments	29,505,000	26,760,000
Foreign Plans | Level 2 | Investment Funds
Change in plan assets:
Fair value of plan assets at end of year	29,505,000	26,760,000
Plan Assets:
Total Investments	29,505,000	26,760,000
Foreign Plans | Level 2 | Mutual Funds Diversified
Change in plan assets:
Fair value of plan assets at end of year	29,505,000	26,760,000
Plan Assets:
Total Investments	29,505,000	26,760,000
Non-qualified supplemental pension plan
Non-qualified supplemental pension plan information
Non funded liability	$ 8,500,000	$ 6,500,000