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PENSIONS - Employer Contributions and Payments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pensions:      
Defined Benefit Plan, Contributions by Employer $ 533 $ 570 $ 397
UK Scheme
     
Pensions:      
Estimated future employer contributions in next fiscal year 660    
Estimated future benefit payments:      
2014 330    
2015 330    
2016 330    
2017 330    
2018 330    
2019 - 2023 1,649    
Marine Scheme
     
Pensions:      
Estimated future employer contributions in next fiscal year 1,800    
Estimated future benefit payments:      
2014 3,000    
2015 3,000    
2016 3,000    
2017 3,000    
2018 3,000    
2019 - 2023 $ 15,000