Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

We had the following activity in our recorded environmental liabilities for the years ended December 31, 2018, 2017 and 2016 (in thousands):



	Year Ended December 31,
	2018			2017			2016
Balance, beginning of year	$	39,808		$	34,919		$	31,436
Expenditures	(6,885		)	(1,818		)	(2,667		)
Accretion of discount	1,283			896			793
Additions and changes in estimates^(a)	17,039			3,344			4,004
Foreign currency translation adjustments and other	(1,676		)	2,467			1,353
Balance, end of year	49,569			39,808			34,919
Less amounts reported in Accrued expenses	9,193			2,290			2,324
Amounts reported in Other noncurrent liabilities	$	40,376		$	37,518		$	32,595


(a)	Increase in additions primarily related to the indemnification of the buyer of a formerly owned site. As defined in the agreement of sale, this indemnification has a set cutoff date in 2024, at which point we will no longer be required to provide financial coverage.

The following is a reconciliation of our beginning and ending asset retirement obligation balances for 2018 and 2017 (in thousands):



	Year Ended December 31,
	2018			2017
Balance, beginning of year	$	40,450		$	36,296
Additions and changes in estimates	740			3,859
Accretion of discount	1,500			1,532
Liabilities settled	(786		)	(789		)
Foreign currency translation adjustments and other	(415		)	(448		)
Balance, end of year	$	41,489		$	40,450

The following schedule details the future non-cancelable minimum lease payments for the next five years and thereafter (in thousands):

The following table summarizes our letters of credit and guarantee agreements (in thousands):



	2019		2020		2021		2022		2023		Thereafter
Letters of credit and other guarantees	$	45,342	$	12,924	$	1,883	$	1,277	$	—	$	10,389