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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 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, 2016

 

$

210,889

 

Additions to asset retirement obligations

 

 

4,003

 

Accretion expense

 

 

4,236

 

Liabilities settled

 

 

(4,039

)

Balance at December 31, 2017

 

$

215,089

 

Additions to asset retirement obligations

 

 

7,583

 

Accretion expense

 

 

4,404

 

Liabilities settled

 

 

(4,087

)

Balance at December 31, 2018

 

$

222,989