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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Declaration of Quarterly Dividend On July 13, 2018, the Board declared a quarterly cash dividend of $0.15 per share on all common stock. The dividend is payable on August 15, 2018, to stockholders of record at the close of business on August 1, 2018.