ASSET RETIREMENT OBLIGATIONS (Notes)

12 Months Ended

Dec. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

ASSET RETIREMENT OBLIGATIONS

ASSET RETIREMENT OBLIGATIONS

In connection with our well servicing activities, we operate a number of SWD facilities. Our operations involve the transportation, handling and disposal of fluids in our SWD facilities that are by-products of the drilling process. SWD facilities used in connection with our fluid hauling operations are subject to future costs associated with the retirement of these properties. As a result, we have incurred costs associated with the proper storage and disposal of these materials.

Annual accretion of the assets associated with the asset retirement obligations was $0.6 million for the years ended December 31, 2013, 2012 and 2011. A summary of changes in our asset retirement obligations is as follows (in thousands):

Balance at December 31, 2011	$	11,928
Additions	—
Costs incurred	(251		)
Accretion expense	594
Disposals	(612		)
Balance at December 31, 2012	11,659
Additions	174
Costs incurred	(135		)
Accretion expense	604
Disposals	(303		)
Balance at December 31, 2013	$	11,999