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COMMITMENTS AND CONTINGENCIES Other (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
BULGARIA [Member]  
Percentage owned by Parent 94.00%
BULGARIA [Member] | Scenario, Adjustment [Member]  
Percentage owned by Parent 90.00%
Dividends Restrictions [Member] | Minimum [Member]  
Dividends Reserve Requirement Restriction Portion Of Annual Net Profits 5.00%
Dividends Reserve Requirement Restriction Portion Of Registered Company Capital 5.00%
Dividends Restrictions [Member] | Maximum [Member]  
Dividends Reserve Requirement Restriction Portion Of Registered Company Capital 25.00%
Dividends Reserve Requirements (less than 25%) 25.00%
Other commitments [Member]  
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months $ 21,717
Unrecorded Unconditional Purchase Obligation, Due within Two Years 7,725
Unrecorded Unconditional Purchase Obligation, Due within Three Years 4,710
Unrecorded Unconditional Purchase Obligation, Due within Four Years 10,467
Unrecorded Unconditional Purchase Obligation, Due within Five Years 350
2020 and thereafter 398
Unrecorded Unconditional Purchase Obligation $ 45,367