The company said the net deficit last year was EUR 42m ($58m), up from EUR 22m in 2012.
It had been forecasting a loss of around EUR 4m, excluding extraordinary charges.
The result was "significantly lower than planned" due to non-cash impairment on fixed assets of EUR 38m, relating to pool arrangements.
Depreciation of about EUR 14m had already been incurred in the first six months.
