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Interest expense, net
 12 Months Ended
Dec. 31, 2020
Interest Expense [Abstract]  
Interest expense, net Interest expense, net
Year ended December 31,20202019
Credit facilities$8,189 $9,826 
Convertible debentures3,299 4,318 
Finance lease obligations3,184 3,691 
Mortgages999 963 
Promissory notes664 1,691 
Financing obligations1,265 272 
Amortization of deferred financing costs1,091 969 
Interest expense$18,691 $21,730 
Other interest income(10)(107)
 $18,681 $21,623