Accrued Final Capping, Closure and Post Closure (Tables)

9 Months Ended

Sep. 30, 2015

Asset Retirement Obligation Disclosure [Abstract]

Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued final capping, closure and post-closure liabilities for the nine months ended September 30, 2015 and 2014 are as follows:


	Nine Months Ended September 30,
	2015			2014
Beginning balance	$	39,829		$	46,326
Obligations incurred		1,971			2,496
Revisions in estimates (1)		—			(3,728	)
Accretion expense		2,513			2,671
Obligations settled (2)		(2,209	)		(3,822	)

Ending balance	$	42,104		$	43,943

(1)

The revisions in estimates for final capping, closure and post-closure costs consisted of changes in cost estimates and the timing of final capping and closure events, as well as changes to expansion airspace and tonnage placement assumptions as a result of our review of landfill asset retirement obligations.

(2)	Obligations settled include amounts that are being processed through accounts payable as a part of our disbursement cycle.