Property, Plant and Equipment and Leased Facilities and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment consisted of the following at December 31, 2019 and 2018 (in thousands):

	Estimated		December 31,
	Useful Life		2019			2018
	(in Years)
Land		—	$	4,972		$	4,972
Buildings		25		35,580			34,696
Machinery and equipment	3 to 25			126,622			132,155
Furniture and fixtures	3 to 5			2,288			2,497
Transportation equipment	3 to 5			2,521			2,627
Improvements		15		40,377			42,182
Construction in progress		—		2,636			1,944
Total property, plant and equipment				214,996			221,073
Accumulated depreciation				(144,512	)		(141,143	)
Property, plant and equipment, net			$	70,484		$	79,930

Schedule of Minimum Rental Payments

Future minimum payments under leases having initial terms of more than twelve months are as follows (in thousands):

	Minimum Payments
2020	$	660
2021		668
2022		677
2023		583
2024		488
Total lease payments		3,076
Less: interest		(481	)
Present value of lease liabilities	$	2,595