OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has affirmed the financial strength rating of A (Excellent) and the issuer credit rating of “a” of National Western Life Insurance Company (NWL) (Denver, CO) [NASDAQ:NWLI]. The outlook for both ratings is stable. The affirmation of the ratings reflects NWL's consistently favorable operating results, which have led to increases in statutory capital, consolidated stockholders' equity and risk-adjusted capitalization. NWL maintains a relatively diverse bus