XML 43 R31.htm IDEA: XBRL DOCUMENT v3.8.0.1
Gas Reserves (Tables)
 9 Months Ended
Sep. 30, 2017
Gas Reserves [Abstract]  
Gas Reserves
The following table outlines our net gas reserves investment:
 
 
September 30,
 
December 31,
In thousands
 
2017
 
2016
 
2016
Gas reserves, current
 
$
16,218


$
16,257


$
15,926

Gas reserves, non-current
 
171,318

 
171,280

 
171,610

Less: Accumulated amortization
 
83,442

 
67,304

 
71,426

Total gas reserves(1)
 
104,094


120,233


116,110

Less: Deferred taxes on gas reserves
 
29,298

 
25,799

 
28,119

Net investment in gas reserves
 
$
74,796

 
$
94,434

 
$
87,991


(1)
Our net investment in additional wells included in total gas reserves was $6.0 million, $7.0 million and $6.7 million at September 30, 2017 and 2016 and December 31, 2016, respectively.