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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 1, 2018, the Company declared a quarterly cash dividend of $2.28 per share, which is payable on December 12, 2018 to the Company's common stockholders of record as of the close of business on November 14, 2018.