IMPAIRMENT LOSSES AND RESTRUCTURING CHARGES (Summary of Activity, Restructuring Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Laramie [Member]
Restructuring Reserve [Roll Forward]
Reclassification of liability	$ 20
Grand Junction [Member]
Restructuring Reserve [Roll Forward]
Reclassification of liability	138
Decatur [Member]
Restructuring Reserve [Roll Forward]
Expense	464
Regina [Member]
Restructuring Reserve [Roll Forward]
Expense	671	1,168
Facility Related Costs [Member] | U.S. [Member]
Restructuring Reserve [Roll Forward]
Balance	798	1,029
Expense		222
Expense (reversal)	306
Payments, net of receipts for sublease	(481)	(525)
Reclassification of liability		72
Balance	623	798
Facility Related Costs [Member] | Victoria [Member]
Restructuring Reserve [Roll Forward]
Balance	483	491
Expense		157
Expense (reversal)	0
Payments, net of receipts for sublease	54	(222)
Reclassification of liability		57
Balance	537	483
Facility Related Costs [Member] | Laramie [Member]
Restructuring Reserve [Roll Forward]
Balance	63	32
Expense		65
Expense (reversal)	(20)
Payments, net of receipts for sublease	(43)	(74)
Reclassification of liability		40
Balance	0	63
Facility Related Costs [Member] | Grand Junction [Member]
Restructuring Reserve [Roll Forward]
Balance	252	506
Expense		0
Expense (reversal)	(138)
Payments, net of receipts for sublease	(114)	(229)
Reclassification of liability		(25)
Balance	0	252
Facility Related Costs [Member] | Decatur [Member]
Restructuring Reserve [Roll Forward]
Balance	0	0
Expense		0
Expense (reversal)	464
Payments, net of receipts for sublease	(378)	0
Reclassification of liability		0
Balance	86	0
Facility Related Costs [Member] | Canada [Member]
Restructuring Reserve [Roll Forward]
Balance	852	1,065
Expense	671	1,255
Payments, net of receipts for sublease	(1,197)	(1,430)
Reclassification of liability		(14)
Foreign currency translation adjustment	8	(24)
Balance	334	852
Facility Related Costs [Member] | Regina [Member]
Restructuring Reserve [Roll Forward]
Balance	852	1,033
Expense	671	1,168
Payments, net of receipts for sublease	(1,197)	(1,325)
Reclassification of liability		0
Foreign currency translation adjustment	8	(24)
Balance	334	852
Facility Related Costs [Member] | Sarnia [Member]
Restructuring Reserve [Roll Forward]
Balance	0	32
Expense	0	0
Payments, net of receipts for sublease	0	(32)
Reclassification of liability		0
Foreign currency translation adjustment	0	0
Balance	0	0
Facility Related Costs [Member] | Kingston [Member]
Restructuring Reserve [Roll Forward]
Balance	0	0
Expense	0	87
Payments, net of receipts for sublease	0	(73)
Reclassification of liability		(14)
Foreign currency translation adjustment	0	0
Balance	0	0
Termination Benefits [Member] | Canada [Member]
Restructuring Reserve [Roll Forward]
Balance		0
Expense		1,638
Payments, net of receipts for sublease		(1,598)
Foreign currency translation adjustment		(40)
Balance		0
Termination Benefits [Member] | Kingston [Member]
Restructuring Reserve [Roll Forward]
Balance		0
Expense		557
Payments, net of receipts for sublease		(453)
Foreign currency translation adjustment		(104)
Balance		0
Termination Benefits [Member] | Cornwall [Member]
Restructuring Reserve [Roll Forward]
Balance		0
Expense		1,081
Payments, net of receipts for sublease		(1,145)
Foreign currency translation adjustment		64
Balance		$ 0