Stockholders' Equity Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Stockholders' Equity Attributable to Parent [Abstract]

Quarterly dividends declared [Table Text Block]

The Board declared quarterly dividends as follows:

	2018		2017
	(amounts per share)
First quarter	$	0.20	$	0.125
Second quarter	0.20		0.150