NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the credit ratings for DDR Corp. (NYSE: DDR or the company) including the Issuer Default Rating (IDR) at 'BBB-'. The Rating Outlook is Stable. A full list of ratings follows at the end of this release. KEY RATING DRIVERS The affirmation of the IDR at 'BBB-' takes into account DDR's credit strengths including ongoing improvements in the quality of the company's retail property portfolio and the management team's focus on refining the asset ba