NBC also broadcast an NHL game in 1940; the league would briefly air games in the 1950s, but due to a dispute over how much of the rights fee money the players would receive (and difficulties programming around the two Canadian teams in the league at the time), the NHL refused to televise its games in the United States for six years in the 1960s. For this reason, as well as the regional nature of the sport, televised NHL games have struggled to gain a foothold on American television for the past several decades, trailing the other leagues in ratings. After several decades of bouncing around various networks (and a stretch from 1975 to 1994 when the league had no permanent broadcast partner), the NHL established a stable broadcast partner in 2004, when NBC and what was then Outdoor Life Network (now NBCSN) took over NHL broadcast rights; they have since renewed those rights through 2021.