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Contingencies (Narrative) (Details)
£ in Thousands, $ in Thousands
1 Months Ended
Oct. 31, 2018
GBP (£)
Oct. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Galveston Accident [Member]          
Loss Contingencies [Line Items]          
Loss Contingency, Damages Sought, Value     $ 25,000    
Merchant Navy Ratings Pension Fund [Member]          
Loss Contingencies [Line Items]          
Other liabilities, current       £ 172 $ 224
Merchant Navy Ratings Pension Fund [Member] | Subsequent Event [Member]          
Loss Contingencies [Line Items]          
Defined benefit plan, contributions by employer £ 123 $ 163