Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

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

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

	Years Ended December 31,
	2019	2018	2017
Weighted average common shares outstanding—basic	89,353	89,215	89,056
Dilutive effect of potential common shares	206	132	120
Weighted average common shares outstanding—diluted	89,559	89,347	89,176