Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2018

Asset Retirement Obligation Disclosure [Abstract]

Summary of changes in asset retirement obligations

The following table provides a summary of the changes in the Company’s asset retirement obligations:

(in thousands)	Amount
Balance at January 1, 2018	$	10,412
Accretion expense	870
Balance at September 30, 2018	$	11,282