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Non-Current Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Defined benefit pension obligations, net (note 9) $ 3,320 $ 6,061
Other non-current liabilities 10,126 11,050
Non-current other liabilities $ 13,446 $ 17,111