Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Summary of Asset Retirement Obligation

Changes to the Company’s asset retirement obligation are summarized below:

	December 31, 2015			December 31, 2014
	(thousands of dollars)
Balance, beginning of period	$	4,196		$	3,834
Additions, changes in estimates and other		-			136
Liabilities settled		(178	)		(199	)
Included in liabilities held for sale		(105	)		(105	)
Accretion expense		450			425
Balance, end of period		4,363			4,091
Less: Current portion		(121	)		(196	)
Non-current portion	$	4,242		$	3,895