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Finance costs
 12 Months Ended
Dec. 31, 2019
Borrowing costs [abstract]  
Finance cost
Finance costs:
For the years ended December 31
2019

2018

Finance costs before capitalized interest
$
127,282

$
95,631

Less capitalized interest related to Geismar plant under construction
(2,856
)
(1,215
)
Finance costs
$
124,426

$
94,416



Finance costs are primarily comprised of interest on borrowings and lease obligations, amortization of deferred financing fees and accretion expense associated with site restoration costs.