Litigation (Details) $ in Thousands	Jan. 27, 2014 USD ($) defendant	Jul. 01, 2008 jury_trial defendant	Sep. 30, 2018 USD ($) case	Sep. 04, 2018 USD ($)	Apr. 17, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
California litigation accrual			$ 136,333
Trial by Jury, State of Rhode Island
Loss Contingencies [Line Items]
Number of jury trials | jury_trial		2
Number of additional defendants | defendant		2
Santa Clara County, California Proceeding
Loss Contingencies [Line Items]
Number of additional defendants | defendant	2
Amount payable jointly and severally for litigation	$ 1,150,000
Abatement fund amount proposed by plaintiffs					$ 730,000
Maximum abatement amount proposed by defendants					$ 409,100
Abatement amount ordered by court				$ 409,100
Personal Injury | Pending Litigation
Loss Contingencies [Line Items]
Number of pending cases | case			3