Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2016

Asset Retirement Obligation [Abstract]

Asset Retirement Obligation Transactions

Balance December 31, 2014	$	2,008
Accretion expense		126
Liabilities incurred		—
Liabilities settled		(24)
Revision in estimated liabilities		112
Balance December 31, 2015	$	2,222
Accretion expense		143
Liabilities incurred		2
Liabilities settled		(86)
Liabilities sold properties		(25)
Revisions in estimated liabilities		(210)
Balance December 31, 2016	$	2,046