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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