CLOSURE AND POST-CLOSURE OBLIGATIONS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Changes to closure and post-closure obligations
Closure and post-closure obligations, beginning of period	$ 73,164	$ 72,870
Accretion expense	1,042	2,077	$ 716
Payments	(1,553)	(2,136)
Currency translation	37	(121)
Closure and post-closure obligations, end of period	72,690	72,690
Less current portion	(5,338)	(5,338)		$ (5,359)
Long-term portion	$ 67,352	$ 67,352		$ 67,511