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27. Operating costs and expenses | 12 Months Ended
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Dec. 31, 2017
Operating Costs And Expenses |
Operating costs and expenses |
| 2017 | 2016 | 2015
Operating costs |  |  |
Salaries, payroll charges and benefits | (1,841,571) | (1,718,199) | (1,503,383)
Pension obligations | (48,381) | 131,469 | (75,247)
Construction costs (Note 24) | (3,080,542) | (3,651,364) | (3,263,808)
General supplies | (163,712) | (173,224) | (172,561)
Treatment supplies | (287,592) | (279,150) | (269,294)
Outsourced services | (857,063) | (845,334) | (791,156)
Electricity | (794,352) | (932,435) | (815,164)
General expenses | (531,985) | (471,965) | (369,213)
Depreciation and amortization | (1,173,765) | (1,072,918) | (1,000,937)
| (8,778,963) | (9,013,120) | (8,260,763)
Selling expenses |  |  |
Salaries, payroll charges and benefits | (305,440) | (271,690) | (237,848)
Pension obligations | (7,296) | 17,941 | (9,761)
General supplies | (4,451) | (3,585) | (3,692)
Outsourced services | (258,287) | (278,565) | (247,687)
Electricity | (762) | (751) | (770)
General expenses | (94,112) | (93,180) | (86,064)
Depreciation and amortization | (15,664) | (9,729) | (9,883)
Bad debt expense, net of recoveries (Note 9 (c)) | (82,681) | (90,488) | (2,420)
| (768,693) | (730,047) | (598,125)
Administrative revenue (expenses) |  |  |
Salaries, payroll charges and benefits | (229,752) | (194,357) | (182,215)
Pension obligations | (171,830) | (136,358) | (185,206)
GESP Reimbursement – benefits paid (Note 10 (a) (vii)) | - | - | 696,283
General supplies | (5,675) | (2,585) | (2,340)
Outsourced services | (183,746) | (154,926) | (123,802)
Electricity | (965) | (1,848) | (1,596)
General expenses | (302,113) | (289,862) | (11,467)
Depreciation and amortization | (112,468) | (63,979) | (63,212)
Tax expenses | (92,441) | (90,981) | (81,487)
| (1,098,990) | (934,896) | 44,958
Operating costs and expenses |  |  |
Salaries, payroll charges and benefits | (2,376,763) | (2,184,246) | (1,923,446)
Pension obligations | (227,507) | 13,052 | (270,214)
GESP Reimbursement – benefits paid (Note 10 (a) (vii)) | - | - | 696,283
Construction costs (Note 24) | (3,080,542) | (3,651,364) | (3,263,808)
General supplies | (173,838) | (179,394) | (178,593)
Treatment supplies | (287,592) | (279,150) | (269,294)
Outsourced services | (1,299,096) | (1,278,825) | (1,162,645)
Electricity | (796,079) | (935,034) | (817,530)
General expenses | (928,210) | (855,007) | (466,744)
Depreciation and amortization | (1,301,897) | (1,146,626) | (1,074,032)
Tax expenses | (92,441) | (90,981) | (81,487)
Bad debt expense, net of recoveries (Note 9 (c)) | (82,681) | (90,488) | (2,420)
| (10,646,646) | (10,678,063) | (8,813,930)

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