We report on the performance of a dual-wavelength resonant, traveling-wave optical parametric oscillator to generate squeezed light for application in advanced gravitational-wave interferometers. Shot noise suppression of $8.6\pm 0.8\mathrm{dB}$ was measured across the detection band of interest to Advanced LIGO, and controlled squeezing measured over $5900\mathrm{s}$ . Our results also demonstrate that the traveling-wave design has excellent intracavity backscattered light suppression of $47\mathrm{dB}$ and incident backscattered light suppression of $41\mathrm{dB}$ , which is a crucial design issue for application in advanced interferometers.