XML 118 R87.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Segment Information - Reconciliation of Capital Expenditures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Capital Expenditures $ 107,278 $ 101,620 $ 92,625
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Capital Expenditures 6,510 4,013 2,925
Mining | Operating Segments      
Segment Reporting Information [Line Items]      
Capital Expenditures $ 100,768 $ 97,607 $ 89,700