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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property Plant And Equipment [Abstract]  
Schedule of Property, Plant and Equipment

 

 

 

Useful lives in

 

 

December 31,

 

 

 

years

 

 

2015

 

 

2014

 

 

 

 

 

 

 

(In Thousands)

 

Machinery, equipment and automotive

 

3 - 30

 

 

$

589,098

 

 

$

360,222

 

Proved natural gas properties

 

*

 

 

 

76,277

 

 

 

72,529

 

Buildings and improvements

 

10 - 30

 

 

 

62,426

 

 

 

55,975

 

Furniture, fixtures and store equipment

 

3 - 10

 

 

 

6,399

 

 

 

6,492

 

Assets under capital leases

 

 

3

 

 

 

425

 

 

 

240

 

Land improvements

 

10 - 40

 

 

 

7,433

 

 

 

7,125

 

Construction in progress

 

N/A

 

 

 

507,287

 

 

 

292,324

 

Capital spare parts

 

N/A

 

 

 

18,047

 

 

 

8,722

 

Land

 

N/A

 

 

 

9,780

 

 

 

9,780

 

 

 

 

 

 

 

 

1,277,172

 

 

 

813,409

 

Less accumulated depreciation, depletion and

   amortization

 

 

 

 

 

 

271,684

 

 

 

194,204

 

 

 

 

 

 

 

$

1,005,488

 

 

$

619,205