Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligations (Tables)

v3.8.0.1
Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2017
Asset Retirement Obligations [Abstract]  
Summary of Changes In Asset Retirement Obligations



 

 

 

 

 

 

 

 

 

(in thousands)

 

 

2017

 

 

2016

 

 

2015

Balance at January 1

 

$

18,612 

 

$

16,166 

 

$

14,846 

Accretion

 

 

951 

 

 

903 

 

 

778 

Additions

 

 

 —

 

 

 —

 

 

1,085 

Acquisitions and dispositions

 

 

(103)

 

 

1,544 

 

 

 —

Revisions

 

 

703 

 

 

(1)

 

 

(543)

Balance at December 31

 

$

20,163 

 

$

18,612 

 

$

16,166