Related Parties (Tables)

3 Months Ended

Mar. 31, 2018

Related Party Transactions [Abstract]

Schedule of Related Party Transactions

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

	Three months ended
	March 31, 2018		March 31, 2017
	(in thousands)
Sales to affiliates	$	145	$	684
Payments to affiliates	10		3

	March 31, 2018		December 31, 2017
	(in thousands)
Due from affiliates	$	12	$	9
Due to affiliates	10		—