The parent company of the Denver Post disputed a report Thursday afternoon that followed Moody's Investors Services downgrade of its credit rating to one suggesting "a substantial risk" of default. An Editor & Publisher article noted that MediaNews Group's debt-to-earning ratio was almost as high as that carried by the Tribune Co., which filed to reorganize under Chapter 11 bankruptcy on Monday, but the privately held MediaNews Group said the comparison failed to take numerous factors into account and insisted the company wasn't in danger.