Stockholders' Equity Dividends Declared (Tables)

3 Months Ended

Mar. 31, 2018

Dividends Declared [Abstract]

Dividends Declared [Table Text Block]

The following is a summary of each dividend declared during fiscal year 2018 and 2017:

Declaration Date	Dividend per Common Share		Record Date	Payment Date
February 9, 2017	$	0.3650	February 22, 2017	March 9, 2017
May 4, 2017	$	0.3750	May 19, 2017	June 2, 2017
August 2, 2017	$	0.3850	August 14, 2017	September 1, 2017
October 31, 2017	$	0.3950	November 17, 2017	December 5, 2017
February 2, 2018	$	0.4050	February 22, 2018	March 9, 2018