Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2017

Asset Retirement Obligation Disclosure [Abstract]

Summary of Changes in Company's 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, 2017	$	9,370
Accretion expense		260
Balance at March 31, 2017	$	9,630