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PENSIONS - Employer Contributions and Payments (Details) - Pensions
$ in Thousands
Dec. 31, 2017
USD ($)
UK Scheme  
Pensions:  
Employer contributions $ 541
Estimated future benefit payments:  
2018 460
2019 325
2020 350
2021 570
2022 365
2023 - 2027 2,460
Marine Scheme  
Pensions:  
Employer contributions 3,000
Estimated future benefit payments:  
2018 3,000
2019 3,000
2020 3,000
2021 3,000
2022 3,000
2023 - 2027 $ 12,500