Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of Remediation Reserve Activity

A roll-forward of remediation reserves on the balance sheet is comprised of the following:

	Years Ended December 31,
	2018			2017			2016
Balance at beginning of period	$	17,067		$	18,176		$	20,603
Remediation expense	1,182			307			556
Remediation payments	(6,967		)	(1,416		)	(2,983		)
Other activity (1)	(8		)	—			—
Balance at end of the period	$	11,274		$	17,067		$	18,176
(1) Other activity includes currency translation adjustments not recorded through remediation expense