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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2021
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 September 30, Nine Months Ended September 30,
2021202020212020
Weighted-average common shares outstanding—basic89,407 89,509 89,505 89,476 
Dilutive effect of potential common shares159 — 141 153 
Weighted-average common shares outstanding—diluted89,566 89,509 89,646 89,629