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Other liabilities
12 Months Ended
Dec. 31, 2017
Other Liabilities [Abstract]  
Other liabilities

13. Other liabilities

20172016
Deferred sales$29,148$29,423
Derivatives [note 24]23,41458,885
Accrued pension and post-retirement benefit liability [note 23]74,80469,699
Other53,10725,725
180,473183,732
Less current portion(54,370)(60,744)
Net$126,103$122,988

There were no performance obligations relating to financing arrangements entered into by NUKEM included in deferred sales at the end of 2017 (2016 - $6,143,000 ($4,575,000 (US))) (note 7).