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COMMITMENTS (Future Minimum Payments) (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Commitments  
Remaining 2019 $ 4,406
2020 696
2021 46
2022 3
2023 0
Thereafter 0
Commitments, total 5,151
Development Projects  
Commitments  
Remaining 2019 2,130
2020 0
2021 0
2022 0
2023 0
Thereafter 0
Commitments, total 2,130
Pension Contribution  
Commitments  
Remaining 2019 1,326
2020 442
2021 0
2022 0
2023 0
Thereafter 0
Commitments, total 1,768
Commitments  
Commitments  
Remaining 2019 950
2020 254
2021 46
2022 3
2023 0
Thereafter 0
Commitments, total $ 1,253