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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 1, 2017, the Board of Directors declared a cash dividend of $0.30 per common share and a special cash dividend of $0.50 per common share. Both dividends are payable on December 28, 2017 to shareholders of record on December 15, 2017.