OTHER COMPREHENSIVE INCOME (Amounts Reclassified from Accumulated Other Comprehensive Income to Earnings) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ (82,041)	$ (33,126)	$ (154,572)	$ (100,192)
Cost of revenues		789,199	703,931	2,155,536	1,958,581
Selling, administrative and general expenses		73,350	76,311	238,263	235,460
Benefit from income taxes		39,080	49,803	81,557	91,575
Total		108,579	142,024	273,639	306,890
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total		1,615	327	3,117	963
Reclassification Adjustment for Cash Flow Hedge Losses [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense		1,955	507	3,022	1,490
Benefit from income taxes		(767)	(200)	(1,186)	(588)
Total	[1]	1,188	307	1,836	902
Amortization of Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of revenues		576	27	1,721	82
Selling, administrative and general expenses		127	6	388	18
Benefit from income taxes		(276)	(13)	(828)	(39)
Total		427	20	1,281	61
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss reclassified from AOCI		$ 1,955	$ 507	3,022	$ 1,490
Cash Flow Hedges [Member] | Debt [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss reclassified from AOCI				$ 1,405

[1] 1The 2017 losses reclassified from AOCI include the acceleration of deferred losses in the amount of $1,405,000 referable to the July debt purchases as described in Note 7.