CHANGES IN ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in AOCI by component
Beginning balance, net of tax	$ (37,747)	$ (2,264)	$ (38,801)	$ (1,419)
Other comprehensive income (loss) before reclassifications	3,008	1,260	4,680	51
Less income (loss) reclassified from AOCI	(608)	(304)	(1,154)	(475)
Net other comprehensive (loss) income	3,616	1,564	5,834	526
Income taxes	334	(16)	(830)	177
Ending balance, net of tax	(33,797)	(716)	(33,797)	(716)
Foreign currency translation adjustments
Changes in AOCI by component
Beginning balance, net of tax	26,090	37,957	25,913	38,663
Other comprehensive income (loss) before reclassifications	3,004	1,109	4,183	120
Less income (loss) reclassified from AOCI	(1,192)	(133)	(1,345)	(263)
Net other comprehensive (loss) income	4,196	1,242	5,528	383
Income taxes	(201)	(17)	954	(170)
Ending balance, net of tax	30,487	39,216	30,487	39,216
Retirement plans related adjustments
Changes in AOCI by component
Beginning balance, net of tax	(64,014)	(40,074)	(64,570)	(40,213)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Less income (loss) reclassified from AOCI	523	(116)	12	(234)
Net other comprehensive (loss) income	(523)	116	(12)	234
Income taxes	(119)	(1)	(164)	(22)
Ending balance, net of tax	(64,418)	(39,957)	(64,418)	(39,957)
Unrealized gain (loss) on cash flow hedges
Changes in AOCI by component
Beginning balance, net of tax	177	(147)	(144)	131
Other comprehensive income (loss) before reclassifications	4	151	497	(69)
Less income (loss) reclassified from AOCI	61	(55)	179	22
Net other comprehensive (loss) income	(57)	206	318	(91)
Income taxes	(14)	34	40	15
Ending balance, net of tax	$ 134	$ 25	$ 134	$ 25