Terra Nitrogen Company, L.P. reported consolidated earnings results for the fourth quarter and year ended December 31, 2017. For the quarter, the company reported total net sales of $97.5 million against $93.4 million a year ago due to higher ammonia sales volumes and higher UAN selling prices that were partially offset by lower ammonia selling prices and lower UAN sales volume. Earnings from operations was $49.1 million against $44.1 million a year ago. Net earnings were $49.4 million against $44.1 million a year ago. Net earnings allocated to class B common units was $0.5 against $0.4 a year ago. Net earnings per common unit was $1.44 against $1.85 a year ago. Net earnings allocable to common units was $26.6 million against $34.3 million a year ago. The fourth quarter of 2017 included a gain of $14.3 million on the sale of TNCLP's 50% joint venture interest in Oklahoma CO2 Partnership (OKCO2), which added $0.42 to fourth quarter 2017 earnings per common unit. Results for the fourth quarter of 2017 also included an unrealized net mark-to-market loss on natural gas derivatives of $0.9 million compared to a gain of $13.6 million in the fourth quarter of 2016. For the year, the company reported total net sales of $397.2 million against $418.3 million a year ago. Earnings from operations was $153.4 million against $209.2 million a year ago. Net earnings was $153.9 million against $209.3 million a year ago. Net earnings allocated to class B common units was $1.5 against $2.0 a year ago. Net earnings per common unit was $5.93 against $7.56 a year ago. Net earnings allocable to common units was $109.8 million against $139.9 million a year ago. Results for the full year 2017 included a gain of $14.3 million on the sale of OKCO2, which added $0.55 to the full year 2017 earnings per common unit. Results for the full year 2017 included an unrealized net mark-to-market loss on natural gas derivatives of $10.6 million compared to an unrealized net mark-to-market gain of $35.3 million for the full year 2016.