A thermoplastic composition, comprising, based on a total weight of the composition: at least 15 weight percent, preferably at least 20 weight percent, of a first poly(aliphatic ester-carbonate) having a first weight average molecular weight, wherein the weight average molecular weight of the first poly(aliphatic ester-carbonate) is 50,000 to 80,000 grams per mole, preferably 65,000 to 75,000 grams per mole, when measured by gel permeation chromatography using bisphenol A homopolycarbonate standards; at least 10 weight percent, preferably at least 20 weight percent of a second poly(aliphatic ester-carbonate) having a second weight average molecular weight that is lower than the first weight average molecular weight, wherein the weight average molecular weight of the second poly(aliphatic ester-carbonate) is 30,000 to 50,000 grams per mole, preferably 36,000 to 45,000 grams per mole, when measured by gel permeation chromatography using bisphenol A homopolycarbonate standards; 0.01 to 0.5 weight percent of a mold release agent; 0.01 to 0.5 weight percent of a thermal stabilizer; and 0.01 to 0.5 weight percent of a chain extender, wherein the foregoing amounts total 100 weight percent, and are based on the total weight of the composition, and wherein the thermoplastic composition has an average melt volume flow rate of less than 40 cubic centimeters per 10 minutes, preferably less than 30 cubic centimeters per 10 minutes, when measured at 300°C at a shear load of 1.2 kg, dwell 300 seconds, in accordance with ASTM 1238, and an average melt volume flow rate of less than 40 cubic centimeters per 10 minutes, preferably less than 30 cubic centimeters per 10 minutes when measured at 250°C at a shear load of 5.0 kg, dwell 300 seconds, in accordance with ASTM 1238. at least 15 weight percent, preferably at least 20 weight percent, of a first poly(aliphatic ester-carbonate) having a first weight average molecular weight, wherein the weight average molecular weight of the first poly(aliphatic ester-carbonate) is 50,000 to 80,000 grams per mole, preferably 65,000 to 75,000 grams per mole, when measured by gel permeation chromatography using bisphenol A homopolycarbonate standards; at least 10 weight percent, preferably at least 20 weight percent of a second poly(aliphatic ester-carbonate) having a second weight average molecular weight that is lower than the first weight average molecular weight, wherein the weight average molecular weight of the second poly(aliphatic ester-carbonate) is 30,000 to 50,000 grams per mole, preferably 36,000 to 45,000 grams per mole, when measured by gel permeation chromatography using bisphenol A homopolycarbonate standards; 0.01 to 0.5 weight percent of a mold release agent; 0.01 to 0.5 weight percent of a thermal stabilizer; and 0.01 to 0.5 weight percent of a chain extender, wherein the foregoing amounts total 100 weight percent, and are based on the total weight of the composition, and wherein the thermoplastic composition has an average melt volume flow rate of less than 40 cubic centimeters per 10 minutes, preferably less than 30 cubic centimeters per 10 minutes, when measured at 300°C at a shear load of 1.2 kg, dwell 300 seconds, in accordance with ASTM 1238, and an average melt volume flow rate of less than 40 cubic centimeters per 10 minutes, preferably less than 30 cubic centimeters per 10 minutes when measured at 250°C at a shear load of 5.0 kg, dwell 300 seconds, in accordance with ASTM 1238.