CREATE TABLE table_18943 ("Asset Acquired" TEXT, "Acquired From" TEXT, "Date Announced" TEXT, "Date Completed" TEXT, "Reported Cost" TEXT)

On what date was the asset acquisition that was announced on February 22, 2007 completed?
SELECT "Date Completed" FROM table_18943 WHERE "Date Announced" = 'February 22, 2007'
SELECT "Date Completed" FROM "table_18943" WHERE "Date Announced" = 'February 22, 2007'