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HEALTH, SAFETY AND ENVIRONMENTAL MATTERS Table 1 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accrual for Environmental Loss Contingencies [Roll Forward]    
Balance as of the beginning of year $ 6,598 $ 6,233
Additions to accrual 3,685 3,292
Payments (2,574) (2,878)
Foreign currency translation (42) (49)
Balance as of the end of year $ 7,667 $ 6,598