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PENSIONS - Employer Contributions and Payments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
UK Scheme  
Pensions:  
Employer contributions $ 370
Estimated future benefit payments:  
2017 284
2018 370
2019 308
2020 432
2021 493
2022 - 2026 2,467
Marine Scheme  
Pensions:  
Employer contributions 1,800
Estimated future benefit payments:  
2017 3,000
2018 3,000
2019 3,000
2020 3,000
2021 3,000
2022 - 2026 $ 15,000