Contingencies (Details) |
9 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Apr. 17, 2015
Insurance_company
People
Plaintiff
Entity
|
Apr. 17, 2013
People
|
Sep. 30, 2018
Litigation_case
|
Dec. 31, 2015
mine
|
|
Pending Litigation | ||||
Loss Contingencies [Line Items] | ||||
Number of people killed | 15 | |||
Number of people injured | 200 | |||
Number of plaintiffs | Plaintiff | 400 | |||
Number of entities that filed claims | Entity | 9 | |||
Number of people that filed claims | 325 | |||
Number of insurance companies that filed claims | Insurance_company | 80 | |||
Settled Litigation [Member] | ||||
Loss Contingencies [Line Items] | ||||
Loss Contingency, Claims Settled, Number | Litigation_case | 200 | |||
IDAHO | ||||
Loss Contingencies [Line Items] | ||||
Loss contingency, number of mines | mine | 17 |