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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

3.  Property, Plant and Equipment

 

 

 

Average

 

December 31,

 

 

 

useful lives  (1)

 

2020

 

 

2019

 

 

 

 

 

(In Thousands)

 

Machinery, equipment and automotive

 

25

 

$

1,213,359

 

 

$

1,204,695

 

Buildings and improvements

 

26

 

 

44,123

 

 

 

38,810

 

Land improvements

 

34

 

 

8,223

 

 

 

8,223

 

Furniture, fixtures and store equipment

 

5

 

 

1,080

 

 

 

1,122

 

Construction in progress

 

N/A

 

 

18,389

 

 

 

31,575

 

Capital spare parts

 

N/A

 

 

26,894

 

 

 

24,245

 

Land

 

N/A

 

 

4,567

 

 

 

4,575

 

 

 

 

 

 

1,316,635

 

 

 

1,313,245

 

Less accumulated depreciation and amortization

 

 

 

 

425,437

 

 

 

376,771

 

 

 

 

 

$

891,198

 

 

$

936,474

 

 

(1)

Weighted average useful lives as of December 31, 2020.

Machinery, equipment and automotive primarily includes the categories of property and equipment and estimated useful lives as follows: processing plants and plant infrastructure (15-30 years); certain processing plant components (3-10 years); and trucks, automobiles, trailers, and other rolling stock (2-7 years).