Accounts Receivable, net (Tables)

12 Months Ended

Dec. 31, 2018

Trade and other receivables [abstract]

Disclosure of detailed information about trade and other receivables [Text Block]

	January 1, 2017			December 31, 2017		December 31, 2018
	(in thousands)
Accounts receivable	$	193,929			188,774		189,569
Less: Allowance for doubtful accounts		(1,395	)		-		-
Less: Loss allowance		-			-		(290	)
	$	192,534			188,774		189,279

Disclosure of detailed information about expected credit loss of accounts receivable [Text Block]

Analysis of expected credit losses as of December 31, 2018, which was measured based on the aforementioned method, was as follows:

	Carrying amount of accounts receivable		Weighted average loss rate			Loss allowance for lifetime expected credit
	(in thousands)
Not past due	$	186,654		0.00	%		-
Past due within 30 days		2,622		0.00	%		-
Past due 31-60 days		3		0%-0.01	%		-
Past due 61-90 days		-		0%-6.29	%		-
Past due 91-120 days		-		0%-18.21	%		-
Past due over 121 days		-		100.00	%		-
	$	189,279					-

Disclosure of detailed information about aging analysis of trade and other receivables [Text Block]

As of January 1, 2017 and December 31, 2017, the Company measured the allowance for doubtful accounts for accounts receivable based on a review of collectability of accounts receivable. Aging analysis of accounts receivable, which were past due but not impaired, as of January 1, 2017 and December 31, 2017, was as follows:

	January 1, 2017		December 31, 2017
	(in thousands)

Not past due	$	188,414		186,681
Past due within 30 days		3,875		1,506
Past due 31-60 days		347		396
Past due 61-90 days		-		-
Past due 91-120 days		-		1
Past due over 121 days		1,293		190
	$	193,929		188,774

Disclosure of detailed information about loss allowance of trade and other receivables [Text Block]

The activity in the loss allowance is as follows:

Loss Allowance

Period	Balance at Beginning of year		Charges to earnings		Amounts utilized / write-offs			Balance at end of year
	(in thousands)

Year 2017	$	1,395		155		(1,550	)		-
Year 2018	$	-		290		-			290