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Gas Reserves (Tables)
 6 Months Ended
Jun. 30, 2018
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines our net gas reserves investment:
 
 
June 30,
 
December 31,
In thousands
 
2018
 
2017
 
2017
Gas reserves, current
 
$
16,579

 
$
16,072

 
$
15,704

Gas reserves, non-current
 
170,958

 
171,464

 
171,832

Less: Accumulated amortization
 
95,596

 
79,444

 
87,779

Total gas reserves(1)
 
91,941

 
108,092

 
99,757

Less: Deferred taxes on gas reserves
 
20,381

 
31,074

 
22,712

Net investment in gas reserves
 
$
71,560

 
$
77,018

 
$
77,045


(1)
Our net investment in additional wells included in total gas reserves was $5.5 million, $6.3 million and $5.8 million at June 30, 2018 and 2017 and December 31, 2017, respectively.