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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events
Subsequent Events	(20) Subsequent Events On February 8, 2018, the Company declared a quarterly dividend of nineteen cents ($0.19) per share on each outstanding share of Class A common stock and Class B common stock payable on March 16, 2018 to stockholders of record on March 2, 2018.