PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - SCHEDULE OF DEFINED BENEFIT OBLIGATIONS, PLAN ASSETS AND FUNDED STATUS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts recognized in Accumulated Other Comprehensive Income (Loss), net of tax:
Net amounts recognized in AOCI	$ 189,187	$ 205,230
Pension Benefits
Change in benefit obligation
Projected benefit obligation at beginning of year	1,031,206	1,117,564
Service cost	20,878	21,223	$ 20,657
Interest cost	35,756	31,943	40,996
Actuarial loss (gain)	89,092	(50,432)
Curtailment	0	(16)
Settlement	(21,445)	(61,268)
Currency translation and other	2,956	(4,674)
Benefits paid	53,237	23,134
Projected benefit obligation at end of year	1,105,206	1,031,206	1,117,564
Change in plan assets
Fair value of plan assets at beginning of year	963,861	1,086,226
Actual return on plan assets	157,931	(43,118)
Employer contributions	3,660	9,233
Settlement	(21,445)	(61,268)
Currency translation and other	2,668	(4,078)
Benefits paid	53,237	23,134
Fair value of plan assets at end of year	1,053,438	963,861	1,086,226
Funded status at end of year	(51,768)	(67,345)
Amounts recognized in the Consolidated Balance Sheets:
Other assets	10,481	332
Accrued liabilities	(3,476)	(1,298)
Other long-term liabilities	(58,773)	(66,379)
Total	(51,768)	(67,345)
Amounts recognized in Accumulated Other Comprehensive Income (Loss), net of tax:
Actuarial net (loss) gain	(216,443)	(254,735)
Net prior service credit (cost)	27,031	32,350
Net amounts recognized in AOCI	(189,412)	(222,385)
Other Benefits
Change in benefit obligation
Projected benefit obligation at beginning of year	214,719	236,112
Service cost	151	230	263
Interest cost	7,837	6,923	8,837
Actuarial loss (gain)	23,635	(10,842)
Curtailment	0	0
Settlement	0	0
Currency translation and other	589	(1,073)
Benefits paid	16,474	16,631
Projected benefit obligation at end of year	230,457	214,719	236,112
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	16,474	16,631
Settlement	0	0
Currency translation and other	0	0
Benefits paid	16,474	16,631
Fair value of plan assets at end of year	0	0	$ 0
Funded status at end of year	(230,457)	(214,719)
Amounts recognized in the Consolidated Balance Sheets:
Other assets	0	0
Accrued liabilities	(19,251)	(19,553)
Other long-term liabilities	(211,206)	(195,166)
Total	(230,457)	(214,719)
Amounts recognized in Accumulated Other Comprehensive Income (Loss), net of tax:
Actuarial net (loss) gain	444	17,967
Net prior service credit (cost)	(219)	(812)
Net amounts recognized in AOCI	$ 225	$ 17,155