... $35,968Costs and expenses:Cost of sales 23,045 20,255 23,438Sales and marketing 7,476 7,261 6,840Research and development 5,043 5,105 3,323General and administrative 1,9511,788 1,722Total cost and ... thousands):1999 1998Revenues:Natural gas, oil, and other liquids $63,405 $59,088Other 1,06517664,470 59,264Costs and expenses:Operating, exploration, and taxes 19,099 18,844General and ... decision makers find financial statements helpful.Some of these decision makers and their decisions include the following:1. Financial analysts and advisors. Many investors and creditors seek...