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COMMITMENTS AND CONTINGENCIES Other (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Percentage owned by Parent 100.00%
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 $ 15,999
Unrecorded Unconditional Purchase Obligation, Due within Two Years 10,169
Unrecorded Unconditional Purchase Obligation, Due within Three Years 5,507
Unrecorded Unconditional Purchase Obligation, Due within Four Years 11,251
Unrecorded Unconditional Purchase Obligation, Due within Five Years 330
2020 and thereafter 340
Unrecorded Unconditional Purchase Obligation $ 43,596