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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Declaration of Quarterly Dividend Payment On January 10, 2018, the Board declared a quarterly cash dividend payment of $0.13 per share on all common stock, a $0.01 per share increase relative to our prior quarterly cash dividend. The dividend was paid on February 15, 2018, to stockholders of record at the close of business on February 1, 2018.