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Gains (losses) from operating activities in the statement of income by function of expenses, included according to their nature (Details 8) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Raw materials and consumables   $ (260,863) $ (227,620) $ (208,697)
Classes of Employee Benefit Expenses        
Personnel expenses   (260,863) (227,620) (208,697)
Depreciation and amortization expense        
Depreciation expense   212,582 232,275 271,128
Amortization expense   (160) (219) (184)
Operating leases   (79,951) (84,257) (75,784)
Investment plan expenses   13,384 17,180 17,697
Contractors   (86,313) (78,920) (72,112)
Mining concessions   (8,168) (7,802) (7,313)
Operations transport   (64,352) (69,052) (59,399)
Freight and product transport costs   (43,510) (55,383) (64,857)
Purchase of products from third parties   239,781 208,147 211,928
CORFO rights   (182,954) (46,274) (41,962)
Export costs   84,816 83,057 105,307
Other expenses, by nature   (38,925) (14,034) (4,818)
Other expenses by nature   (1,638,557) (1,549,593) (1,499,254)
Other expenses by nature [Member]        
Depreciation and amortization expense        
Legal expenses $ (25,176) (15,139)   (5,737)
Purchase of products from third parties (208,147) (239,781)   (211,928)
Office Expenses (15,612) (17,981)   (17,215)
Export costs (83,057) (84,816)   (105,307)
Representation Expenses (4,781) (4,805)   (4,022)
Restructuring of joint ventures (6,000) 6,000   0
Plant suspension expenses   0 $ 0 (32,061)
Consultant and advisor services (14,348) (12,848)   (16,474)
Variation in inventory $ (90,998) $ 11,600   $ (10,774)