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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
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

 

 

419

 

Accretion expense

 

 

2,093

 

Liabilities settled

 

 

(1,908

)

Balance at June 30, 2017

 

$

211,493