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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment

4.  Property, Plant and Equipment

 

 

 

Useful lives in

 

December 31,

 

 

 

years

 

2018

 

 

2017

 

 

 

 

 

(In Thousands)

 

Machinery, equipment and automotive

 

3 - 30

 

$

1,189,438

 

 

$

1,163,532

 

Buildings and improvements

 

10 - 30

 

 

39,032

 

 

 

42,886

 

Land improvements

 

10 - 40

 

 

8,076

 

 

 

8,111

 

Furniture, fixtures and store equipment

 

3

 

 

1,122

 

 

 

1,466

 

Construction in progress

 

N/A

 

 

28,753

 

 

 

27,973

 

Capital spare parts

 

N/A

 

 

28,945

 

 

 

29,835

 

Land

 

N/A

 

 

4,583

 

 

 

7,764

 

 

 

 

 

 

1,299,949

 

 

 

1,281,567

 

Less accumulated depreciation and

   amortization

 

 

 

 

325,701

 

 

 

267,529

 

 

 

 

 

$

974,248

 

 

$

1,014,038

 

 

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).