Property and Equipment

12 Months Ended

Dec. 31, 2023

Property And Equipment [Abstract]

PROPERTY AND EQUIPMENT

6. PROPERTY AND EQUIPMENT.

Property and equipment consisted of the following (in thousands):

	December 31,
	2023			2022
Facilities and plant equipment	$	405,010		$	386,932
Land		3,687			3,687
Other equipment, vehicles and furniture		9,719			9,876
Construction in progress		50,505			37,538
		468,921			438,033
Accumulated depreciation		(220,173	)		(198,964	)
	$	248,748		$	239,069

Depreciation expense was $22,492,000, $24,528,000 and $23,292,000 for the years ended December 31, 2023, 2022 and 2021, respectively.

The Company capitalized interest of $2,454,000, $720,000 and $628,000 for the years ended December 31, 2023, 2022 and 2021, respectively, related to its capital investment activities.

The Company’s property and equipment are substantially collateralized under the Company’s Term Loan.