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Employee benefits expenses (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefits Expenses      
Wages and salaries S/ 95,684 S/ 101,250 S/ 87,052
Workers profit sharing, note 13 21,554 18,692 23,393
Social contributions 20,626 23,687 17,739
Legal bonuses 14,133 13,477 12,124
Vacations 12,572 11,974 11,338
Long-term compensation, note 13 11,401 16,088 14,159
Cessation payments 9,201 19,184 6,834
Training 2,557 1,510 3,429
Others 1,214 1,432 1,972
Total employee benefits expenses S/ 188,942 S/ 207,294 S/ 178,040