BENEFIT PLANS (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Number Of Defined Contribution Plans		2
Projected benefit obligation		$ 1,083,222,000	$ 911,700,000	$ 991,338,000
Expected return on plan assets		7.50%
Employer contribution		5,488,000	4,855,000	4,509,000
Estimated employer contribution in 2014		13,718,000
Contributions to multiemployer pension plans		8,503,000	7,580,000	7,227,000
Percentage of contributions to individual multiemployer pension funds		5.00%	5.00%	5.00%
Percentage of domestic hourly labor force covered by collective bargaining agreements		15.00%
Percentage of domestic hourly labor force covered by collective bargaining agreements expiring in 2015		12.00%
Accrued costs for supplemental retirement plan		1,421,000	1,328,000
Assets in the Chemicals Hourly Plan			91,803,000
Plan amendments		0	(39,443,000)
Amount plan assets of Chemical Plan exceeds accumulated benefit obligation			3,919,000
Amount plan assets of Chemical Plan exceeds projected benefit obligation			3,056,000
Projected weighted average rate of compensation		3.70%
Healthcare cost trend rate assumed for next year		7.50%
Rate to which the cost trend rate gradually declines		5.00%
Year that the rate reaches the rate it is assumed to maintain		2025
Expense recognized related to defined contribution plans		29,215,000	21,416,000	18,460,000
Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees		272
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets, minimum		50.00%
Target allocation ranges for plan assets, maximum		77.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets, minimum		15.00%
Target allocation ranges for plan assets, maximum		27.00%
Specialty Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets, minimum		0.00%
Target allocation ranges for plan assets, maximum		20.00%
Cash Reserves [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets, minimum		0.00%
Target allocation ranges for plan assets, maximum		5.00%
Commodity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation ranges for plan assets, minimum		0.00%
Target allocation ranges for plan assets, maximum		6.00%
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans		3
Pension expense			(7,600,000)
Normal retirement age		65 years
One-time curtailment gain		0	(855,000)	0
Accumulated benefit obligation		1,061,816,000	891,394,000
Estimated net actuarial loss expected to be amortized from accumulated other comprehensive income		20,762,000
Estimated prior service cost that will be amortized from accumulated other comprehensive income		47,000
Expected return on plan assets		7.50%	7.50%	8.00%
Employer contribution			0	0
Discount rate		4.14%	4.91%	4.19%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		3.70%	3.50%	3.50%
Pension Plans, Defined Benefit | Discontinued Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense			(800,000)
Non Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded, nonqualified pension plans		3
Projected benefit obligation		101,230,000	93,600,000
Accumulated benefit obligation		95,154,000	89,289,000
Employer contribution		5,488,000	4,855,000	4,509,000
Estimated employer contribution in 2014		13,718,000
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Liability reduction from curtailment		(2,639,000)	0
Normal retirement age		65 years
One-time curtailment gain	3,832,000	3,832,000	0	0
Projected benefit obligation		85,336,000	92,888,000	113,500,000
Estimated net actuarial loss expected to be amortized from accumulated other comprehensive income		258,000
Estimated prior service cost that will be amortized from accumulated other comprehensive income		(4,232,000)
Estimated employer contribution in 2014		$ 8,964,000
Discount rate		3.50%	4.10%	3.30%
Healthcare cost trend rate assumed for next year		7.50%	7.50%	8.00%
Rate to which the cost trend rate gradually declines		5.00%	5.00%	5.00%
Year that the rate reaches the rate it is assumed to maintain		2025	2019	2019
Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate		3.50%	3.80%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.30%	5.15%