Related Parties (Tables)

9 Months Ended

Sep. 30, 2018

Related Party Transactions [Abstract]

Schedule of Related Party Transactions

The following is a summary of transactions and balance with affiliates:

	Three months ended				Nine months ended
	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
	(in thousands)
Sales to affiliates	$	298	$	76	$	890	$	1,226
Payments to affiliates	48		107		159		415

	September 30, 2018		December 31, 2017
	(in thousands)
Due from affiliates	$	144	$	9
Due to affiliates	—		—