Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenue from External Customers by Geographic Areas

The following table summarizes net sales by end market:

(in thousands)	For the Three Months Ended March 31,
End Market	2019		2018
Industrial	$	50,587	$	45,719
Energy	45,648		38,567
Transportation	19,552		10,127
Total	$	115,787	$	94,413

The following table summarizes net sales by geographic area:

(in thousands)	For the Three Months Ended March 31,
Geographic Area	2019		2018
North America	$	97,679	$	79,947
Pacific Rim	12,625		10,339
Europe	3,377		3,315
Other	2,106		812
Total	$	115,787	$	94,413

Schedule of Contract Balances

(in thousands)	As of
	March 31, 2019			December 31, 2018
Short-term contract assets (included in Prepaid expenses and other current assets)	$	5,709		$	2,926
Short-term contract liabilities (included in Other accrued liabilities)	(7,862		)	(4,897		)
Long-term contract liabilities (included in Noncurrent contract liabilities)	(13,769		)	(14,611		)
Net contract liabilities	$	(15,922	)	$	(16,582	)