Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2018

Asset Retirement Obligation Disclosure [Abstract]

Information Related to Asset Retirement Obligations

The following table reflects information related to our asset retirement obligations:

Balance at December 31, 2017	$	215,089
Additions to asset retirement obligations		793
Accretion expense		3,332
Liabilities settled		(3,164	)
Balance at September 30, 2018	$	216,050