Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Summary of Revenue from External Customers by Geographic Areas

The following table summarizes net sales by end market:

(in thousands)	For the Year Ended December 31,
End Market	2020		2019
Energy	$	149,282	$	222,779
Industrial	131,026		180,111
Transportation	137,331		143,186
Total	$	417,639	$	546,076

The following table summarizes net sales by geographic area:

(in thousands)	For the Year Ended December 31,
Geographic Area	2020		2019
North America	$	376,276	$	483,302
Pacific Rim	25,869		39,180
Europe	9,339		16,562
Other	6,155		7,032
Total	$	417,639	$	546,076

Schedule of Contract Balances

(in thousands)	As of December 31,
	2020		2019
Short-term contract assets (included in Prepaid expenses and other current assets)	$	547	$	694
Short-term contract liabilities (included in Other accrued liabilities)	(47,960)		(26,898)
Long-term contract liabilities (included in Noncurrent contract liabilities)	(3,181)		(17,998)
Net contract liabilities	$	(50,594)	$	(44,202)