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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 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
 
(3,587
)
Accretion expense
 
1,258

Revision of estimated cash flows
 
(2,986
)
Balance at June 30, 2019
 
$
32,388