BENEFIT PLANS (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) employee ShareBasedCompensationPlan item	Dec. 31, 2014 USD ($) item	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number Of Defined Contribution Plans | ShareBasedCompensationPlan			2
Projected benefit obligation			$ 988,453	$ 1,083,222	$ 911,700
Employer contributions			14,047	5,488	4,855
Contributions to multiemployer pension plans			9,800	$ 8,503	$ 7,580
Estimated employer contribution in 2016			$ 9,107
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			14.00%
Percentage of domestic hourly labor force covered by collective bargaining agreements expiring in 2016			40.00%
Number of unfunded supplemental retirement plans | item			1	1
Accrued costs for supplemental retirement plan			$ 1,384	$ 1,421
Expense recognized related to defined contribution plans			$ 36,085	29,215	$ 21,416
Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees | employee			315
Equities [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 Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans | ShareBasedCompensationPlan			3
Normal retirement age			65 years
Pension expense					(7,600)
One-time curtailment gain			$ 0	0	$ (855)
Accumulated benefit obligation			$ 987,724	$ 1,061,816
Expected return on plan assets			7.50%	7.50%	7.50%
Employer contributions			$ 0	$ 0	$ 0
Discount rate			4.54%	4.14%	4.91%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase			3.50%	3.70%	3.50%
Pension Plans, Defined Benefit [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial loss expected to be amortized from accumulated other comprehensive income		$ 6,067
Estimated prior service cost that will be amortized from accumulated other comprehensive income		$ (43)
Estimated weighted-average discount rate to measure service cost		4.89%
Estimated weighted-average discount rate to measure interest cost		3.80%
Estimated weighted-average discount rate for service and interest costs		4.54%
Estimated reduction in benefit cost		$ 7,200
Pension Plans, Defined Benefit [Member] | Discontinued Operations [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension expense					$ (800)
Non Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded, nonqualified pension plans | ShareBasedCompensationPlan			3
Projected benefit obligation			$ 89,652	$ 101,230
Accumulated benefit obligation			89,652	95,154
Employer contributions			$ 14,047	5,488	4,855
Non Qualified Pension Plans [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contribution in 2016		9,107
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Normal retirement age			65 years
Reduction in the projected benefit obligation			$ 0	2,639
One-time curtailment gain	$ 3,832		0	3,832	0
Projected benefit obligation			48,605	$ 85,336	$ 92,888
Estimated employer contribution in 2016			$ 6,287
Discount rate			3.69%	3.50%	4.10%
Healthcare cost trend rate assumed for next year				7.50%	7.50%
Rate to which the cost trend rate gradually declines				5.00%	5.00%
Year that the rate reaches the rate it is assumed to maintain				2025	2019
Other Postretirement Benefit Plans, Defined Benefit [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial loss expected to be amortized from accumulated other comprehensive income		(1,828)
Estimated prior service cost that will be amortized from accumulated other comprehensive income		$ (4,236)
Estimated weighted-average discount rate to measure service cost		4.05%
Estimated weighted-average discount rate to measure interest cost		2.81%
Estimated weighted-average discount rate for service and interest costs		3.69%
Estimated reduction in benefit cost		$ 530
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.53%	3.50%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.68%	4.30%