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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events
Subsequent Events	14. Subsequent Events On November 1, 2018, the Company declared a quarterly dividend of twenty-one cents ($0.21) per share on each outstanding share of Class A common stock and Class B common stock payable on December 14, 2018 to stockholders of record on November 30, 2018.