Mortgage rates held steady Thursday following the release of stronger than expected economic data. Third quarter GDP was revised higher to show economic growth of 3.1%, well above the 2.7% level reported last month. Weekly Jobless Claims rose to 361,000, close to forecast. Leading Indicators declined 0.2%, matching expectations. The Philadelphia Fed Index, a survey of manufacturers in the region, rose to 8.1. A reading of -2.0 had been expected. Readings above zero indicate expansion in the manufacturing sector. Existing Home Sales jumped 5.9% to 5.04 million annual units, the highest level in three years. No other key data will be released today.