CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Changes in AOCI by component
Beginning balance, net of tax	$ (33,797)	$ (716)	$ (38,801)	$ (1,419)
Other comprehensive income (loss) before reclassifications	(6,975)	(5,286)	(2,295)	(5,235)
Less income (loss) reclassified from AOCI	(803)	(267)	(1,957)	(742)
Net other comprehensive (loss) income	(6,172)	(5,019)	(338)	(4,493)
Income taxes	506	(927)	(324)	(750)
Ending balance, net of tax	(39,463)	(6,662)	(39,463)	(6,662)
Foreign currency translation adjustments
Changes in AOCI by component
Beginning balance, net of tax	30,487	39,216	25,913	38,663
Other comprehensive income (loss) before reclassifications	(6,082)	(5,281)	(1,899)	(5,161)
Less income (loss) reclassified from AOCI	1,087	1,087	(258)	824
Net other comprehensive (loss) income	(7,169)	(6,368)	(1,641)	(5,985)
Income taxes	(625)	756	329	586
Ending balance, net of tax	23,943	32,092	23,943	32,092
Retirement plans related adjustments
Changes in AOCI by component
Beginning balance, net of tax	(64,418)	(39,957)	(64,570)	(40,213)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Less income (loss) reclassified from AOCI	(1,748)	(1,336)	(1,736)	(1,570)
Net other comprehensive (loss) income	1,748	1,336	1,736	1,570
Income taxes	218	170	54	148
Ending balance, net of tax	(62,888)	(38,791)	(62,888)	(38,791)
Unrealized gain (loss) on cash flow hedges
Changes in AOCI by component
Beginning balance, net of tax	134	25	(144)	131
Other comprehensive income (loss) before reclassifications	(893)	(5)	(396)	(74)
Less income (loss) reclassified from AOCI	(142)	(18)	37	4
Net other comprehensive (loss) income	(751)	13	(433)	(78)
Income taxes	(99)	1	(59)	16
Ending balance, net of tax	$ (518)	$ 37	$ (518)	$ 37