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Non-Current Other Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Non-Current Other Liabilities
 
December 31, 2018

December 31, 2017

 
(in thousands)
Defined benefit pension obligations, net (note 9)
$
3,320

$
6,061

Other non-current liabilities
10,126

11,050

 
$
13,446

$
17,111