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Gas Reserves (Tables)
 9 Months Ended
Sep. 30, 2018
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines net gas reserves investment:
 
 
September 30,
 
December 31,
In thousands
 
2018
 
2017
 
2017
Gas reserves, current
 
$
16,916

 
$
16,218

 
$
15,704

Gas reserves, non-current
 
170,391

 
171,318

 
171,832

Less: Accumulated amortization
 
99,835

 
83,442

 
87,779

Total gas reserves(1)
 
87,472

 
104,094

 
99,757

Less: Deferred taxes on gas reserves
 
19,377

 
29,298

 
22,712

Net investment in gas reserves
 
$
68,095

 
$
74,796

 
$
77,045


(1)
The net investment in additional wells included in total gas reserves was $5.0 million, $6.0 million and $5.8 million at September 30, 2018 and 2017 and December 31, 2017, respectively.