Net sales for the quarter increased by US$36.6 million or 14.4% to US$290.1 million compared to US$253.5 million in the same period in 2017. Total billings increased by US$62.1 million or 25.6% to US$304.8 million for the three months ended December 31, 2018 compared to US$242.7 million in the same period in 2017.
Net sales of wind blades were US$257.8 million for the quarter as compared to US$231.0 million in the same period in 2017. Total cost of goods sold for the quarter was US$277.5 million and included US$20.5 million related to startup costs in our new plants in Turkey, Mexico, Iowa and China, the startup costs related to a new customer in Taicang, China and transition costs of US$0.7 million related to the four lines in transition during the quarter. This compares to total cost of goods sold of US$223.2 million for the same period in 2017. Corporate overhead costs included within general and administrative expenses for the three months ended December 31, 2018 totaled US$11.6 million, down slightly from US$12.0 million for the same period in 2017. Remaining general and administrative expenses during the three months ended December 31, 2018 were US$4.6 million. The net loss for the quarter was US$8.8 million as compared to net income of US$2.2 million in the same period in 2017. The decrease was primarily due to higher startup and transition costs. EBITDA for the quarter decreased to US$3.8 million, compared to US$24.2 million during the same period in 2017. EBITDA margin decreased to 1.3% compared to 9.5% in the same period in 2017. Adjusted EBITDA for the quarter decreased to US$9.8 million compared to US$28.4 million during the same period in 2017. Adjusted EBITDA margin decreased to 3.4% compared to 11.2% during the same period in 2017.
For the full year 2018 the company reported net sales of US$1,029.6 million (US$955.1 in 2017) with total billings of US$1,006.5 million (US$941.5 in 2017). Net income amounted to US$5.3 million (US$38.7 in 2017) and EBITDA was US$42.3 million (US$88.5 in 2017), with an EBITDA margin of 4.1% . Adjusted EBITDA amounted to US$68.2 million (US$100.1 in 2017), with an Adjusted EBITDA margin of 6.6%
