Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The denominators of the basic and diluted earnings per share computations are as follows (in thousands):

	Three Months Ended June 30,		Six Months Ended June 30,
	2020	2019	2020	2019
Weighted-average common shares outstanding—basic	89,489	89,357	89,459	89,333
Dilutive effect of potential common shares	136	204	143	204
Weighted-average common shares outstanding—diluted	89,625	89,561	89,602	89,537