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Subsequent Events Subsequent Events	9 Months Ended
Subsequent Events Subsequent Events	Sep. 30, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events Common Stock Dividend On October 15, 2018, the Company's board of directors declared a quarterly cash dividend of $1.125 per common share. The quarterly dividend will be paid on December 31, 2018 to common stockholders of record as of December 14, 2018.