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Gas Reserves (Tables)
 6 Months Ended
Jun. 30, 2017
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines our net gas reserves investment:
 
 
June 30,
 
December 31,
In thousands
 
2017
 
2016
 
2016
Gas reserves, current
 
$
16,072


$
15,707


$
15,926

Gas reserves, non-current
 
171,464

 
171,834

 
171,610

Less: Accumulated amortization
 
79,444

 
63,548

 
71,426

Total gas reserves(1)
 
108,092


123,993


116,110

Less: Deferred taxes on gas reserves
 
31,074

 
26,737

 
28,119

Net investment in gas reserves
 
$
77,018

 
$
97,256

 
$
87,991


(1)
Our net investment in additional wells included in total gas reserves was $6.3 million, $7.3 million and $6.7 million at June 30, 2017 and 2016 and December 31, 2016, respectively.