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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	15. Subsequent Events Subsequent to December 31, 2016, Sonic’s Board of Directors authorized an additional $100.0 million to repurchase shares of Sonic’s Class A common stock, increasing Sonic’s remaining repurchase authorization to approximately $145.0 million before including the effect of any share repurchases subsequent to December 31, 2016.