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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2018
Asset Retirement Obligations [Abstract]  
Summary of Changes In Asset Retirement Obligations



 

 

 

 

 

 

 

 

 

(in thousands)

 

 

2018

 

 

2017

 

 

2016

Balance at January 1

 

$

20,163 

 

$

18,612 

 

$

16,166 

Accretion

 

 

1,180 

 

 

951 

 

 

903 

Acquisitions and dispositions

 

 

 —

 

 

(103)

 

 

1,544 

Revisions

 

 

(6,527)

 

 

703 

 

 

(1)

Balance at December 31

 

$

14,816 

 

$

20,163 

 

$

18,612