Property And Equipment	12 Months Ended
	Dec. 31, 2021
Property And Equipment [Abstract]
Property And Equipment	9. PROPERTY AND EQUIPMENT The components of property and equipment are as follows (in thousands): December 31, 2021 2020Plant equipment$ 1,000,820 $ 940,363Buildings and improvements 180,713 170,813Land and improvements 83,403 86,909Railroad track and equipment 32,971 34,637Construction-in-progress 111,745 48,378Computer hardware and software 19,927 20,477Office furniture and equipment 3,356 3,797Leasehold improvements and other 27,609 26,510Total property and equipment 1,460,544 1,331,884Less: accumulated depreciation and amortization (567,027) (530,194)Property and equipment, net$ 893,517 $ 801,690 Interest capitalized during the years ended December 31, 2021, 2020 and 2019 totaled $7.3 million, $1.8 million and $1.9 million, respectively.