ACCOUNTS RECEIVABLE

12 Months Ended

Dec. 31, 2019

Accounts Receivable, after Allowance for Credit Loss [Abstract]

ACCOUNTS RECEIVABLE

.    ACCOUNTS RECEIVABLE

Accounts receivable comprised the following at December 31, 2019 and December 31, 2018:

	December 31, 2019			December 31, 2018
Third-party customers	$	197,166		$	203,068
Less: allowance for bad debts and credit notes	(8,548		)	(9,697		)
Total accounts receivable	$	188,618		$	193,371

Bad debt (release) / expense for the years ended December 31, 2019, 2018 and 2017 was US$ (2.5) million, US$ 0.8 million, and US$ 1.9 million, respectively.