ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	$ (11,608)	$ (10,950)	$ (32,229)	$ (30,068)
Net of tax			60,670
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service credits	(280)	(420)	(840)	(564)
Actuarial losses	61	949	183	5,465
Total before tax	(219)	529	(657)	4,901
Tax expense (benefit)	83	(176)	249	(1,784)
Net of tax	$ (136)	$ 353	$ (408)	$ 3,117