...+ U.S.-based movie exhibitor National Amusements Inc.'s (NAI's) margin of compliance with its covenants has widened to about 20% as of July 2, 2015, because of strong domestic summer box office receipts and an increase in its dividend income. + We are revising our outlook on National Amusements Inc. and its operating subsidiary NAI Entertainment Holdings LLC (NAIEH) to stable from negative. + We are also affirming all of our ratings on both companies, including our 'B+' corporate credit ratings. + The stable outlook reflects our expectation that NAI will continue to be exposed to volatile box-office performance, but that the company will be able to maintain "strong" liquidity supported by its dividend income from Viacom and CBS. CHICAGO (Standard & Poor's) Oct. 30, 2015--Standard & Poor's Ratings Services said today that it has revised its outlook on Norwood, Mass.-based National Amusements Inc. and its operating subsidiary NAI Entertainment Holdings LLC, which we analyze on a consolidated...