1975-1992, 2015 (40th Anniversary)
1993-2002
2003-2006
2007-2011
2011-present
Merger with Six Flags pending
Amusement parks: California's Great America | Canada's Wonderland | Carowinds | Cedar Point | Dorney Park & Wildwater Kingdom | Kings Dominion | Kings Island | Knott's Berry Farm | Michigan's Adventure | Valleyfair | Worlds of Fun Water parks: Former parks: |