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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
Schedule of Property, Plant and Equipment

 

 

 

Useful lives in

 

December 31,

 

 

 

years

 

2017

 

 

2016

 

 

 

 

 

(In Thousands)

 

Machinery, equipment and automotive

 

2 - 30

 

$

1,163,532

 

 

$

1,159,001

 

Proved natural gas properties

 

*

 

 

—

 

 

 

76,679

 

Buildings and improvements

 

10 - 30

 

 

42,886

 

 

 

40,810

 

Furniture, fixtures and store equipment

 

4

 

 

1,466

 

 

 

1,661

 

Land improvements

 

10 - 40

 

 

8,111

 

 

 

8,083

 

Construction in progress

 

N/A

 

 

27,973

 

 

 

25,640

 

Capital spare parts

 

N/A

 

 

29,835

 

 

 

25,655

 

Land

 

N/A

 

 

7,764

 

 

 

8,970

 

 

 

 

 

 

1,281,567

 

 

 

1,346,499

 

Less accumulated depreciation, depletion and

   amortization

 

 

 

 

267,529

 

 

 

267,541

 

 

 

 

 

$

1,014,038

 

 

$

1,078,958