CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in AOCI by component
Beginning balance, net of tax	$ (48,713)	$ (38,801)	$ (1,419)
Other comprehensive (loss) income before reclassifications	(9,342)	(13,417)	(39,576)
Less income reclassified from AOCI	(3,770)	(2,874)	(1,239)
Net other comprehensive (loss) income	(5,572)	(10,543)	(38,337)
Income taxes	371	(631)	(955)
Ending balance, net of tax	(54,656)	(48,713)	(38,801)
Foreign currency translation adjustments
Changes in AOCI by component
Beginning balance, net of tax	20,529	25,913	38,663
Other comprehensive (loss) income before reclassifications	(4,811)	(4,598)	(11,893)
Less income reclassified from AOCI	0	0	0
Net other comprehensive (loss) income	(4,811)	(4,598)	(11,893)
Income taxes	235	786	857
Ending balance, net of tax	15,483	20,529	25,913
Retirement plans related adjustments
Changes in AOCI by component
Beginning balance, net of tax	(69,100)	(64,570)	(40,213)
Other comprehensive (loss) income before reclassifications	(4,594)	(8,607)	(27,551)
Less income reclassified from AOCI	(3,695)	(2,662)	(1,388)
Net other comprehensive (loss) income	(899)	(5,945)	(26,163)
Income taxes	103	(1,415)	(1,806)
Ending balance, net of tax	(70,102)	(69,100)	(64,570)
Unrealized gain (loss) on cash flow hedges
Changes in AOCI by component
Beginning balance, net of tax	(142)	(144)	131
Other comprehensive (loss) income before reclassifications	63	(212)	(132)
Less income reclassified from AOCI	(75)	(212)	149
Net other comprehensive (loss) income	138	0	(281)
Income taxes	33	(2)	(6)
Ending balance, net of tax	$ (37)	$ (142)	$ (144)