Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Changes in Claims

The following table sets forth the number of claims filed, the number of claims settled, dismissed or otherwise resolved, and the aggregate settlement amount during the periods presented:

Year ended December 31,	Opening Number of Claims	Claims Dismissed, Settled, or Resolved	New Claims	Closing Number of Claims	Amounts Paid (thousands) to Settle or Resolve
2013	4,463	230	66	4,299	$78
2014	4,299	625	147	3,821	437
2015	3,821	116	86	3,791	164
2016	3,791	148	102	3,745	758
2017	3,745	105	90	3,730	55
2018 (as of March 31)	3,730	96	28	3,662	$93