Related Parties (Tables)

12 Months Ended

Dec. 31, 2018

Related Party Transactions [Abstract]

Schedule of Related Party Transactions

Following is a summary of transactions and balances with affiliates:

	Years Ending December 31,
	2018		2017		2016
	(in thousands)
Sales to affiliates	$	1,442	$	1,579	$	1,671
Payments to affiliates	342		432		697
			December 31,
			2018		2017
			(in thousands)
Due from affiliates			$	79	$	9
Due to affiliates			—		—