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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Summary of asset retirement obligations
The following table provides a summary of the changes in the Company’s asset retirement obligations:
(in thousands)
Amount
Balance, January 1, 2018
$
10,412

Accretion expense
1,160

Balance, December 31, 2018
$
11,572