BENEFIT PLANS (Narrative) (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) employee ShareBasedCompensationPlan item	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number Of Defined Contribution Plans | ShareBasedCompensationPlan		2
Expected return on plan assets		7.00%	7.50%
Contributions to multiemployer pension plans		$ 10,435,000	$ 9,800,000	$ 8,503,000
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		12.80%
Percentage of domestic hourly labor force covered by collective bargaining agreements expiring in 2017		8.50%
Number of unfunded supplemental retirement plans | item		1	1
Accrued costs for supplemental retirement plan		$ 1,320,000	$ 1,384,000
Amount plan assets of Chemical Plan exceeds accumulated benefit obligation		277,000
Expense recognized related to defined contribution plans		$ 45,295,000	36,085,000	$ 29,215,000
Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees | employee		305
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%
Commodities [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%
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%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans | ShareBasedCompensationPlan		3
Normal retirement age		65 years
Projected benefit obligation		$ 1,006,674,000	988,453,000	$ 1,083,222,000
Accumulated benefit obligation		1,006,001,000	$ 987,724,000
Estimated net actuarial loss expected to be amortized from accumulated other comprehensive income		6,988,000
Estimated prior service cost that will be amortized from accumulated other comprehensive income		$ (73,000)
Expected return on plan assets		7.50%	7.50%	7.50%
Employer contributions		$ 9,576,000	$ 14,047,000	$ 5,488,000
Estimated employer contribution in 2017		$ 18,875,000
Discount rate		4.29%	4.54%	4.14%
Estimated weighted-average discount rate to measure service cost		4.68%
Estimated weighted-average discount rate to measure interest cost		3.79%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		3.50%	3.50%	3.70%
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 0	$ 0	$ 0
Estimated employer contribution in 2017		$ 9,500,000
Non Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded, nonqualified pension plans | ShareBasedCompensationPlan		3
Projected benefit obligation		$ 85,021,000	89,652,000
Accumulated benefit obligation		85,021,000	89,652,000
Employer contributions		9,576,000	14,047,000	5,488,000
Estimated employer contribution in 2017		$ 9,375,000
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Normal retirement age		65 years
Reduction in the projected benefit obligation				2,639,000
One-time curtailment gain	$ 3,832,000	$ 0	0	3,832,000
Projected benefit obligation		45,546,000	$ 48,605,000	$ 85,336,000
Estimated net actuarial loss expected to be amortized from accumulated other comprehensive income		(1,724,000)
Estimated prior service cost that will be amortized from accumulated other comprehensive income		(4,236,000)
Estimated employer contribution in 2017		$ 6,013,000
Discount rate		3.58%	3.69%	3.50%
Estimated weighted-average discount rate to measure service cost		3.77%
Estimated weighted-average discount rate to measure interest cost		2.81%
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
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		3.43%	3.53%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.41%	4.68%