OTHER COMPREHENSIVE INCOME (Amounts Reclassified from Accumulated Other Comprehensive Income to Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (34,076)	$ (33,732)
Cost of revenues	627,349	590,010
Selling, administrative and general expenses	82,120	76,468
Benefit from income taxes	(3,175)	(11,470)
Total	44,921	40,158
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total	747	314
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	528	487
Benefit from income taxes	(208)	(193)
Total	320	294
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	570	27
Selling, administrative and general expenses	133	6
Benefit from income taxes	(276)	(13)
Total	$ 427	$ 20