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Cost of sales, without considering depreciation and amortization (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of cost of sales [Line Items] |  |  |
Other production expenses | $ 15,028 | $ 24,107 | $ 26,739
Cost of sales of services, without considering depreciation and amortization | (12,954) | (10,754) | (59,612)
cost of services [Member] |  |  |
Disclosure of cost of sales [Line Items] |  |  |
Direct labor | 7,398 | 5,983 | 18,314
Services provided by third parties | 1,782 | 1,689 | 16,247
Consumption of materials and supplies | 1,026 | 868 | 7,865
Electricity and water | 586 | 633 | 7,134
Maintenance and repair | 946 | 217 | 637
Rentals | 423 | 480 | 2,544
Insurances | 246 | 212 | 1,233
Transport | 98 | 213 | 3,868
Other production expenses | 449 | 459 | 1,770
Cost of sales of services, without considering depreciation and amortization | $ 12,954 | $ 10,754 | $ 59,612

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