Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2019

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

 A reconciliation of the Company's beginning and ending aggregate carrying amount of the asset retirement obligations are as follows:

	Asset Retirement Obligations
Balance at December 31, 2018	$	37,703
Liabilities settled during the period	(4,559		)
Accretion expense	1,888
Revision of estimated cash flows	159
Balance at September 30, 2019	$	35,191